From 0f53bc4b78e4cc307c4be207a6b53c4e8dae1cd8 Mon Sep 17 00:00:00 2001
From: ddidderr <ddidderr@paul.network>
Date: Tue, 21 Jul 2026 22:30:11 +0200
Subject: [PATCH] feat(call-to-play)!: coordinate game sessions across peers

Implement the launcher design as a production peer-to-peer feature. Call to
Play actions are immutable, validated events broadcast over the existing QUIC
control channel, deduplicated in a bounded in-memory history, and exchanged in
Hello/HelloAck so late joiners reconstruct current calls.

Add the Tauri bridge and modular launcher surfaces for play-now and scheduled
calls, check-in, readiness buffers, role-aware controls, chat, tickers, and
actual caller launch. A deterministic frontend reducer derives presentation
state from replicated history. Extend the JSONL peer harness with publish/list
commands and a three-peer live-delivery and late-join scenario.

This intentionally raises the only supported wire protocol from version 5 to
version 6; older builds are not supported. Document the transport architecture
and exclude generated peer-test state from Docker build contexts.

Test Plan:
- `just fmt` -- passed
- `just clippy` -- passed
- `just test` -- passed
- `just frontend-test` -- passed, 20 tests
- `just build` -- passed
- `just peer-cli-tests S2 S48` -- passed
- `git diff --cached --check` -- passed
---
 .dockerignore                                 |   1 +
 PEER_CLI_SCENARIOS.md                         |   9 +
 .../scripts/run_extended_scenarios.py         |  84 ++-
 crates/lanspread-peer-cli/src/lib.rs          |  32 +-
 crates/lanspread-peer-cli/src/main.rs         |  39 ++
 crates/lanspread-peer/ARCHITECTURE.md         |  15 +
 crates/lanspread-peer/src/call_to_play.rs     | 225 ++++++
 crates/lanspread-peer/src/context.rs          |   5 +
 crates/lanspread-peer/src/identity.rs         |   2 +
 crates/lanspread-peer/src/lib.rs              |  15 +
 crates/lanspread-peer/src/network.rs          |   9 +-
 .../lanspread-peer/src/services/handshake.rs  | 133 +++-
 crates/lanspread-peer/src/services/stream.rs  |  10 +
 crates/lanspread-proto/src/lib.rs             |  40 +-
 .../src-tauri/Cargo.toml                      |   2 +-
 .../src-tauri/src/lib.rs                      |  52 ++
 .../src/components/Icon.tsx                   |  31 +
 .../calltoplay/CallToPlayButton.tsx           |  18 +
 .../calltoplay/CallToPlayOverlay.tsx          | 103 +++
 .../calltoplay/CallToPlayTicker.tsx           | 124 ++++
 .../calltoplay/CreateNominationForm.tsx       | 278 ++++++++
 .../src/components/calltoplay/CtpChat.tsx     |  91 +++
 .../components/calltoplay/NominationCard.tsx  | 361 ++++++++++
 .../src/components/topbar/TopBar.tsx          |   8 +-
 .../src/hooks/useCallToPlay.ts                | 173 +++++
 .../src/lib/callToPlay.ts                     | 290 ++++++++
 .../lanspread-tauri-deno-ts/src/lib/types.ts  |  48 ++
 .../src/styles/launcher.css                   | 642 ++++++++++++++++++
 .../src/windows/MainWindow.tsx                |  39 ++
 .../tests/callToPlay.test.ts                  | 154 +++++
 design/launcher/SPEC.md                       |  20 +-
 31 files changed, 3032 insertions(+), 21 deletions(-)
 create mode 100644 crates/lanspread-peer/src/call_to_play.rs
 create mode 100644 crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayButton.tsx
 create mode 100644 crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayOverlay.tsx
 create mode 100644 crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayTicker.tsx
 create mode 100644 crates/lanspread-tauri-deno-ts/src/components/calltoplay/CreateNominationForm.tsx
 create mode 100644 crates/lanspread-tauri-deno-ts/src/components/calltoplay/CtpChat.tsx
 create mode 100644 crates/lanspread-tauri-deno-ts/src/components/calltoplay/NominationCard.tsx
 create mode 100644 crates/lanspread-tauri-deno-ts/src/hooks/useCallToPlay.ts
 create mode 100644 crates/lanspread-tauri-deno-ts/src/lib/callToPlay.ts
 create mode 100644 crates/lanspread-tauri-deno-ts/tests/callToPlay.test.ts

diff --git a/.dockerignore b/.dockerignore
index 1b90caa..3f028a7 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,6 +1,7 @@
 .git
 .agents
 .codex
+.lanspread-peer-cli
 target
 **/target
 **/node_modules
diff --git a/PEER_CLI_SCENARIOS.md b/PEER_CLI_SCENARIOS.md
index abc35f9..44fe559 100644
--- a/PEER_CLI_SCENARIOS.md
+++ b/PEER_CLI_SCENARIOS.md
@@ -55,6 +55,7 @@ for deterministic local runs; mDNS/macvlan remains an environment smoke path.
 | S45 | Sender disconnect during streamed install | A source serves large catalog-version `alienswarm`; after the client receives the first streamed chunk, the source container is killed. | The operation reaches a terminal failure/peers-gone event, emits no download/install success, clears active operations, and rolls back local/staging state. |
 | S46 | Receiver cancel during streamed install | A client starts streaming large catalog-version `alienswarm`, receives the first chunk, then sends `cancel-download alienswarm`. | The receiver cancels without emitting download/install success or a user-visible download failure, clears active operations, and rolls back local/staging state. |
 | S47 | Multi-archive streamed install order | A source serves `fixture-multi/cnctw` with two root `.eti` archives named to require sorted processing. | Streamed chunk paths arrive in root archive sort order, both payloads install under `local/`, the receiver is local-only installed, and no root archives or sentinel are committed. |
+| S48 | Call to Play replication and late join | Alice and Bob connect; Alice publishes a call, then Bob publishes an RSVP and chat message. Charlie joins afterward and handshakes with Alice. | Alice and Bob receive the live events, while Charlie reconstructs the same three-event history during handshake with no duplicate event IDs. |
 
 ## Version-Skew Contract
 
@@ -143,6 +144,14 @@ Use S39-S41 to pin down low-disk streamed installs:
 
 ## Run Log
 
+### 2026-07-21 - Call to Play Transport (S48)
+
+- Added JSONL commands to publish and inspect Call to Play events.
+- S2 passed against the rebuilt image, preserving bidirectional library
+  exchange after the protocol version bump.
+- S48 passed against the rebuilt image: create, RSVP, and chat propagated live,
+  then a late third peer received the same deduplicated history in handshake.
+
 ### 2026-06-21 - Test-Suite Integrity Audit And Hardening
 
 - An adversarial review of `run_extended_scenarios.py` found assertions that
diff --git a/crates/lanspread-peer-cli/scripts/run_extended_scenarios.py b/crates/lanspread-peer-cli/scripts/run_extended_scenarios.py
index b46f933..528c7a2 100644
--- a/crates/lanspread-peer-cli/scripts/run_extended_scenarios.py
+++ b/crates/lanspread-peer-cli/scripts/run_extended_scenarios.py
@@ -1,5 +1,5 @@
 #!/usr/bin/env python3
-"""Run the peer-cli scenarios S1-S47 through Docker."""
+"""Run the peer-cli scenarios S1-S48 through Docker."""
 
 from __future__ import annotations
 
@@ -242,6 +242,12 @@ class Peer:
     def status(self) -> dict[str, Any]:
         return self.send({"cmd": "status"})["data"]
 
+    def call_to_play_events(self) -> list[dict[str, Any]]:
+        return self.send({"cmd": "list-call-to-play"})["data"]["events"]
+
+    def publish_call_to_play(self, event: dict[str, Any]) -> None:
+        self.send({"cmd": "publish-call-to-play", "event": event})
+
     def connect_to(self, other: "Peer") -> None:
         if other.ready_addr is None:
             raise ScenarioError(f"{other.name} is not ready")
@@ -350,6 +356,7 @@ class Runner:
             ("S45", self.s45_sender_disconnect_mid_stream),
             ("S46", self.s46_receiver_cancel_mid_stream),
             ("S47", self.s47_multi_archive_streams_in_sorted_order),
+            ("S48", self.s48_call_to_play_replication_and_late_join),
         ]
 
         for scenario_id, scenario in scenarios:
@@ -1757,6 +1764,63 @@ class Runner:
 
         return f"multi-archive cnctw streamed in sorted order: {chunk_paths}"
 
+    def s48_call_to_play_replication_and_late_join(self) -> str:
+        alice = self.peer("s48-alice")
+        bob = self.peer("s48-bob")
+        bob.connect_to(alice)
+
+        now = int(time.time() * 1000)
+        create = {
+            "id": "s48-create",
+            "call_id": "s48-call",
+            "actor": "Alice",
+            "at": now,
+            "action": {
+                "Create": {
+                    "game_id": "cnctw",
+                    "max_players": 4,
+                    "scheduled_for": None,
+                    "deadline": now + 600_000,
+                }
+            },
+        }
+        rsvp = {
+            "id": "s48-rsvp",
+            "call_id": "s48-call",
+            "actor": "Bob",
+            "at": now + 1,
+            "action": "Rsvp",
+        }
+        message = {
+            "id": "s48-message-event",
+            "call_id": "s48-call",
+            "actor": "Bob",
+            "at": now + 2,
+            "action": {
+                "SendMessage": {
+                    "message_id": "s48-message",
+                    "text": "I am in",
+                }
+            },
+        }
+
+        alice.publish_call_to_play(create)
+        wait_call_to_play_events(bob, {"s48-create"})
+        bob.publish_call_to_play(rsvp)
+        bob.publish_call_to_play(message)
+        wait_call_to_play_events(alice, {"s48-create", "s48-rsvp", "s48-message-event"})
+
+        charlie = self.peer("s48-charlie")
+        charlie.connect_to(alice)
+        events = wait_call_to_play_events(
+            charlie,
+            {"s48-create", "s48-rsvp", "s48-message-event"},
+        )
+        if len(events) != 3:
+            raise ScenarioError(f"late join history contains duplicates: {events}")
+
+        return "live create/RSVP/chat replicated and a late joiner received deduplicated history"
+
 
 def run(command: list[str], description: str) -> subprocess.CompletedProcess[str]:
     result = subprocess.run(
@@ -2034,6 +2098,24 @@ def wait_no_outbound_transfer(peer: Peer, game_id: str, timeout: float = 20) ->
     )
 
 
+def wait_call_to_play_events(
+    peer: Peer,
+    expected_ids: set[str],
+    timeout: float = 20,
+) -> list[dict[str, Any]]:
+    deadline = time.monotonic() + timeout
+    last_events: list[dict[str, Any]] = []
+    while time.monotonic() < deadline:
+        events = peer.call_to_play_events()
+        last_events = events
+        if expected_ids <= {event.get("id") for event in events}:
+            return events
+        time.sleep(0.2)
+    raise ScenarioError(
+        f"{peer.name} never received Call to Play events {expected_ids}: {last_events}"
+    )
+
+
 def assert_game_state(
     game: dict[str, Any],
     *,
diff --git a/crates/lanspread-peer-cli/src/lib.rs b/crates/lanspread-peer-cli/src/lib.rs
index 7ed9f35..0f9d454 100644
--- a/crates/lanspread-peer-cli/src/lib.rs
+++ b/crates/lanspread-peer-cli/src/lib.rs
@@ -9,7 +9,7 @@ use std::{
 };
 
 use eyre::{Context, OptionExt};
-use lanspread_peer::{UnpackFuture, Unpacker};
+use lanspread_peer::{CallToPlayEvent, UnpackFuture, Unpacker};
 use serde::Serialize;
 use serde_json::{Value, json};
 
@@ -26,6 +26,10 @@ pub enum CliCommand {
     Status,
     ListPeers,
     ListGames,
+    ListCallToPlay,
+    PublishCallToPlay {
+        event: CallToPlayEvent,
+    },
     SetGameDir {
         path: PathBuf,
     },
@@ -67,6 +71,8 @@ impl CliCommand {
             Self::Status => "status",
             Self::ListPeers => "list-peers",
             Self::ListGames => "list-games",
+            Self::ListCallToPlay => "list-call-to-play",
+            Self::PublishCallToPlay { .. } => "publish-call-to-play",
             Self::SetGameDir { .. } => "set-game-dir",
             Self::Download { .. } => "download",
             Self::StreamInstall { .. } => "stream-install",
@@ -102,6 +108,16 @@ pub fn parse_command_value(value: &Value) -> eyre::Result<CommandEnvelope> {
         "status" => CliCommand::Status,
         "list-peers" => CliCommand::ListPeers,
         "list-games" => CliCommand::ListGames,
+        "list-call-to-play" => CliCommand::ListCallToPlay,
+        "publish-call-to-play" => CliCommand::PublishCallToPlay {
+            event: serde_json::from_value(
+                object
+                    .get("event")
+                    .cloned()
+                    .ok_or_eyre("publish-call-to-play must include event")?,
+            )
+            .wrap_err("invalid Call to Play event")?,
+        },
         "set-game-dir" => CliCommand::SetGameDir {
             path: PathBuf::from(required_str(object, "path")?),
         },
@@ -384,6 +400,20 @@ mod tests {
         );
     }
 
+    #[test]
+    fn parses_call_to_play_event_command() {
+        let parsed = parse_command_line(
+            r#"{"cmd":"publish-call-to-play","event":{"id":"event-1","call_id":"call-1","actor":"Alice","at":1000,"action":{"Create":{"game_id":"game-1","max_players":4,"scheduled_for":null,"deadline":61000}}}}"#,
+        )
+        .expect("command should parse");
+
+        let CliCommand::PublishCallToPlay { event } = parsed.command else {
+            panic!("expected PublishCallToPlay");
+        };
+        assert_eq!(event.id, "event-1");
+        assert_eq!(event.call_id, "call-1");
+    }
+
     #[tokio::test]
     async fn fixture_unpacker_creates_install_payload() {
         let temp = TempDir::new("lanspread-peer-cli-fixture");
diff --git a/crates/lanspread-peer-cli/src/main.rs b/crates/lanspread-peer-cli/src/main.rs
index 9e014f7..52b268d 100644
--- a/crates/lanspread-peer-cli/src/main.rs
+++ b/crates/lanspread-peer-cli/src/main.rs
@@ -16,6 +16,7 @@ use lanspread_db::db::{Game, GameCatalog, GameFileDescription};
 use lanspread_peer::{
     ActiveOperation,
     ActiveOperationKind,
+    CallToPlayEvent,
     ExternalUnrarStreamProvider,
     NoopStreamInstallProvider,
     OutboundTransfers,
@@ -101,6 +102,8 @@ struct CliState {
     game_files: HashMap<String, Vec<GameFileDescription>>,
     unavailable_games: HashSet<String>,
     downloads: HashMap<String, DownloadMeasurement>,
+    call_to_play_events: Vec<CallToPlayEvent>,
+    call_to_play_generation: u64,
 }
 
 #[derive(Clone, serde::Serialize)]
@@ -243,6 +246,26 @@ async fn handle_command(
         CliCommand::Status => status(shared).await,
         CliCommand::ListPeers => list_peers(shared).await,
         CliCommand::ListGames => list_games(shared).await,
+        CliCommand::ListCallToPlay => {
+            let generation = shared.state.read().await.call_to_play_generation;
+            sender.send(PeerCommand::GetCallToPlayEvents)?;
+            tokio::time::timeout(Duration::from_secs(1), async {
+                loop {
+                    if shared.state.read().await.call_to_play_generation > generation {
+                        break;
+                    }
+                    shared.notify.notified().await;
+                }
+            })
+            .await
+            .wrap_err("timed out waiting for Call to Play history")?;
+            let events = shared.state.read().await.call_to_play_events.clone();
+            Ok(json!({ "events": events }))
+        }
+        CliCommand::PublishCallToPlay { event } => {
+            sender.send(PeerCommand::PublishCallToPlay(event.clone()))?;
+            Ok(json!({"queued": true, "event_id": event.id}))
+        }
         CliCommand::SetGameDir { path } => {
             sender.send(PeerCommand::SetGameDir(path.clone()))?;
             Ok(json!({"queued": true, "path": path}))
@@ -498,6 +521,22 @@ async fn update_state_from_event(shared: &SharedState, event: PeerEvent) -> (&'s
                 json!({ "active_operations": active_operations_json(&active_operations) }),
             )
         }
+        PeerEvent::CallToPlayEvents(events) => {
+            let mut state = shared.state.write().await;
+            let mut known = state
+                .call_to_play_events
+                .iter()
+                .map(|event| event.id.clone())
+                .collect::<HashSet<_>>();
+            state.call_to_play_events.extend(
+                events
+                    .iter()
+                    .filter(|event| known.insert(event.id.clone()))
+                    .cloned(),
+            );
+            state.call_to_play_generation = state.call_to_play_generation.saturating_add(1);
+            ("call-to-play-events", json!({ "events": events }))
+        }
         PeerEvent::GotGameFiles {
             id,
             file_descriptions,
diff --git a/crates/lanspread-peer/ARCHITECTURE.md b/crates/lanspread-peer/ARCHITECTURE.md
index a42e6e0..4927eae 100644
--- a/crates/lanspread-peer/ARCHITECTURE.md
+++ b/crates/lanspread-peer/ARCHITECTURE.md
@@ -44,6 +44,21 @@ When a peer is discovered:
 - Any message updates `last_seen`.
 - Pings run only when idle (or on a longer interval), not every 5 seconds.
 - Library updates are pushed as deltas, debounced and coalesced.
+- Call to Play actions are broadcast as immutable, uniquely identified events.
+
+### Call to Play replication
+
+Call to Play is transient peer-session state rather than database state. The
+peer keeps a bounded event history, deduplicated by event ID. A local action is
+applied to that history, sent to the UI, and broadcast to every currently known
+peer. An incoming live event is applied once and sent to the UI without being
+rebroadcast, which prevents forwarding loops.
+
+`Hello` and `HelloAck` include each side's event history. This lets peers that
+join after a call was created reconstruct the same nominations, responses,
+RSVPs, chat, and terminal actions. The launcher reducer sorts the event stream
+deterministically and derives deadlines and check-in phases from timestamps.
+There is deliberately no compatibility path for older protocol versions.
 
 ### 4) Shutdown
 
diff --git a/crates/lanspread-peer/src/call_to_play.rs b/crates/lanspread-peer/src/call_to_play.rs
new file mode 100644
index 0000000..7fefbfb
--- /dev/null
+++ b/crates/lanspread-peer/src/call_to_play.rs
@@ -0,0 +1,225 @@
+//! Replicated event history for Call to Play coordination.
+
+use std::collections::HashSet;
+
+use lanspread_proto::{CallToPlayAction, CallToPlayEvent};
+use tokio::sync::mpsc::UnboundedSender;
+
+use crate::{PeerEvent, context::Ctx, events, network::send_call_to_play_events};
+
+const MAX_EVENTS: usize = 4_096;
+const MAX_ID_CHARS: usize = 128;
+const MAX_GAME_ID_CHARS: usize = 256;
+const MAX_USERNAME_CHARS: usize = 24;
+const MAX_MESSAGE_CHARS: usize = 500;
+
+#[derive(Debug, Default)]
+pub(crate) struct CallToPlayStore {
+    events: Vec<CallToPlayEvent>,
+    event_ids: HashSet<String>,
+}
+
+impl CallToPlayStore {
+    pub(crate) fn snapshot(&self) -> Vec<CallToPlayEvent> {
+        self.events.clone()
+    }
+
+    pub(crate) fn insert(&mut self, event: CallToPlayEvent) -> Result<bool, &'static str> {
+        validate_event(&event)?;
+        if self.event_ids.contains(&event.id) {
+            return Ok(false);
+        }
+        if self.events.len() >= MAX_EVENTS {
+            return Err("Call to Play event history is full");
+        }
+
+        self.event_ids.insert(event.id.clone());
+        self.events.push(event);
+        Ok(true)
+    }
+
+    pub(crate) fn insert_all(&mut self, events: Vec<CallToPlayEvent>) -> Vec<CallToPlayEvent> {
+        let mut accepted = Vec::new();
+        for event in events {
+            match self.insert(event.clone()) {
+                Ok(true) => accepted.push(event),
+                Ok(false) => {}
+                Err(err) => log::warn!("Ignoring invalid Call to Play event {}: {err}", event.id),
+            }
+        }
+        accepted
+    }
+}
+
+pub(crate) async fn publish(
+    ctx: &Ctx,
+    tx_notify_ui: &UnboundedSender<PeerEvent>,
+    event: CallToPlayEvent,
+) {
+    match ctx.call_to_play.write().await.insert(event.clone()) {
+        Ok(false) => return,
+        Err(err) => {
+            log::warn!("Rejecting local Call to Play event {}: {err}", event.id);
+            return;
+        }
+        Ok(true) => {}
+    }
+
+    events::send(
+        tx_notify_ui,
+        PeerEvent::CallToPlayEvents(vec![event.clone()]),
+    );
+
+    let peer_addresses = ctx.peer_game_db.read().await.get_peer_addresses();
+    ctx.task_tracker.spawn(async move {
+        let deliveries = peer_addresses.into_iter().map(|peer_addr| {
+            let event = event.clone();
+            async move {
+                if let Err(err) = send_call_to_play_events(peer_addr, vec![event]).await {
+                    log::warn!("Failed to send Call to Play event to {peer_addr}: {err}");
+                }
+            }
+        });
+        futures::future::join_all(deliveries).await;
+    });
+}
+
+fn validate_event(event: &CallToPlayEvent) -> Result<(), &'static str> {
+    validate_nonempty(&event.id, MAX_ID_CHARS, "invalid event id")?;
+    validate_nonempty(&event.call_id, MAX_ID_CHARS, "invalid call id")?;
+    validate_nonempty(&event.actor, MAX_USERNAME_CHARS, "invalid actor")?;
+    if event.at <= 0 {
+        return Err("invalid event timestamp");
+    }
+
+    match &event.action {
+        CallToPlayAction::Create {
+            game_id,
+            max_players,
+            scheduled_for,
+            deadline,
+        } => {
+            validate_nonempty(game_id, MAX_GAME_ID_CHARS, "invalid game id")?;
+            if !(2..=64).contains(max_players) {
+                return Err("max players must be between 2 and 64");
+            }
+            if *deadline <= event.at {
+                return Err("deadline must be after creation");
+            }
+            if scheduled_for.is_some_and(|scheduled| scheduled != *deadline) {
+                return Err("scheduled call deadline must match its start time");
+            }
+        }
+        CallToPlayAction::Respond { ready_at } => {
+            if ready_at.is_some_and(|ready| ready < event.at) {
+                return Err("ready time cannot be before the response");
+            }
+        }
+        CallToPlayAction::SendMessage { message_id, text } => {
+            validate_nonempty(message_id, MAX_ID_CHARS, "invalid message id")?;
+            validate_nonempty(text, MAX_MESSAGE_CHARS, "invalid message")?;
+        }
+        CallToPlayAction::AddTime { deadline } => {
+            if *deadline <= event.at {
+                return Err("extended deadline must be in the future");
+            }
+        }
+        CallToPlayAction::Rsvp
+        | CallToPlayAction::Leave
+        | CallToPlayAction::Cancel
+        | CallToPlayAction::Start => {}
+    }
+
+    Ok(())
+}
+
+fn validate_nonempty(
+    value: &str,
+    max_chars: usize,
+    error: &'static str,
+) -> Result<(), &'static str> {
+    if value.trim().is_empty() || value.chars().count() > max_chars {
+        return Err(error);
+    }
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use lanspread_proto::{CallToPlayAction, CallToPlayEvent};
+
+    use super::CallToPlayStore;
+
+    fn create_event(id: &str) -> CallToPlayEvent {
+        CallToPlayEvent {
+            id: id.to_string(),
+            call_id: "call-1".to_string(),
+            actor: "Alice".to_string(),
+            at: 1_000,
+            action: CallToPlayAction::Create {
+                game_id: "game-1".to_string(),
+                max_players: 4,
+                scheduled_for: None,
+                deadline: 61_000,
+            },
+        }
+    }
+
+    #[test]
+    fn deduplicates_events_without_reordering_history() {
+        let mut store = CallToPlayStore::default();
+        assert!(
+            store
+                .insert(create_event("event-1"))
+                .expect("valid event should be inserted")
+        );
+        assert!(
+            !store
+                .insert(create_event("event-1"))
+                .expect("duplicate valid event should be accepted")
+        );
+        assert!(
+            store
+                .insert(create_event("event-2"))
+                .expect("valid event should be inserted")
+        );
+
+        let ids = store
+            .snapshot()
+            .into_iter()
+            .map(|event| event.id)
+            .collect::<Vec<_>>();
+        assert_eq!(ids, ["event-1", "event-2"]);
+    }
+
+    #[test]
+    fn rejects_malformed_events() {
+        let mut store = CallToPlayStore::default();
+        let mut event = create_event("event-1");
+        event.action = CallToPlayAction::SendMessage {
+            message_id: "message-1".to_string(),
+            text: "   ".to_string(),
+        };
+
+        assert_eq!(store.insert(event), Err("invalid message"));
+        assert!(store.snapshot().is_empty());
+    }
+
+    #[test]
+    fn merge_returns_only_new_valid_events() {
+        let mut store = CallToPlayStore::default();
+        store
+            .insert(create_event("event-1"))
+            .expect("valid event should be inserted");
+        let mut invalid = create_event("invalid");
+        invalid.actor.clear();
+
+        let accepted = store.insert_all(vec![
+            create_event("event-1"),
+            invalid,
+            create_event("event-2"),
+        ]);
+
+        assert_eq!(accepted, [create_event("event-2")]);
+    }
+}
diff --git a/crates/lanspread-peer/src/context.rs b/crates/lanspread-peer/src/context.rs
index db47b93..2d2c8b1 100644
--- a/crates/lanspread-peer/src/context.rs
+++ b/crates/lanspread-peer/src/context.rs
@@ -10,6 +10,7 @@ use crate::{
     PeerEvent,
     StreamInstallProvider,
     Unpacker,
+    call_to_play::CallToPlayStore,
     events,
     library::LocalLibraryState,
     peer_db::PeerGameDB,
@@ -51,6 +52,7 @@ pub struct Ctx {
     pub shutdown: CancellationToken,
     pub task_tracker: TaskTracker,
     pub active_outbound_transfers: OutboundTransfers,
+    pub call_to_play: Arc<RwLock<CallToPlayStore>>,
 }
 
 /// Context for peer connection handling.
@@ -69,6 +71,7 @@ pub struct PeerCtx {
     pub shutdown: CancellationToken,
     pub task_tracker: TaskTracker,
     pub active_outbound_transfers: OutboundTransfers,
+    pub call_to_play: Arc<RwLock<CallToPlayStore>>,
 }
 
 impl std::fmt::Debug for PeerCtx {
@@ -113,6 +116,7 @@ impl Ctx {
             shutdown,
             task_tracker,
             active_outbound_transfers,
+            call_to_play: Arc::new(RwLock::new(CallToPlayStore::default())),
         }
     }
 
@@ -135,6 +139,7 @@ impl Ctx {
             shutdown: self.shutdown.clone(),
             task_tracker: self.task_tracker.clone(),
             active_outbound_transfers: self.active_outbound_transfers.clone(),
+            call_to_play: self.call_to_play.clone(),
         }
     }
 }
diff --git a/crates/lanspread-peer/src/identity.rs b/crates/lanspread-peer/src/identity.rs
index d7632a2..5a14522 100644
--- a/crates/lanspread-peer/src/identity.rs
+++ b/crates/lanspread-peer/src/identity.rs
@@ -6,6 +6,7 @@ use crate::state_paths::peer_id_path;
 
 pub const FEATURE_LIBRARY_DELTA: &str = "library-delta-v1";
 pub const FEATURE_LIBRARY_SNAPSHOT: &str = "library-snapshot-v1";
+pub const FEATURE_CALL_TO_PLAY: &str = "call-to-play-v1";
 
 pub fn load_or_create_peer_id(state_dir: &Path) -> eyre::Result<String> {
     let path = peer_id_path(state_dir);
@@ -28,5 +29,6 @@ pub fn default_features() -> Vec<String> {
     vec![
         FEATURE_LIBRARY_DELTA.to_string(),
         FEATURE_LIBRARY_SNAPSHOT.to_string(),
+        FEATURE_CALL_TO_PLAY.to_string(),
     ]
 }
diff --git a/crates/lanspread-peer/src/lib.rs b/crates/lanspread-peer/src/lib.rs
index fa5b765..9061ff0 100644
--- a/crates/lanspread-peer/src/lib.rs
+++ b/crates/lanspread-peer/src/lib.rs
@@ -12,6 +12,7 @@
 // Module declarations
 // =============================================================================
 
+mod call_to_play;
 mod config;
 mod context;
 mod download;
@@ -46,6 +47,7 @@ pub use config::{CHUNK_SIZE, MAX_RETRY_COUNT};
 pub use error::PeerError;
 pub use install::{UnpackFuture, Unpacker};
 use lanspread_db::db::{Game, GameCatalog, GameFileDescription};
+pub use lanspread_proto::{CallToPlayAction, CallToPlayEvent};
 pub use migration::{MigrationReport, migrate_legacy_state};
 pub use peer_db::{
     MajorityValidationResult,
@@ -159,6 +161,8 @@ pub enum PeerEvent {
     ActiveOperationsChanged {
         active_operations: Vec<ActiveOperation>,
     },
+    /// New or requested Call to Play events in replication order.
+    CallToPlayEvents(Vec<CallToPlayEvent>),
     /// A required peer runtime component failed.
     RuntimeFailed {
         component: PeerRuntimeComponent,
@@ -259,6 +263,10 @@ pub enum PeerCommand {
     GetPeerCount,
     /// Connect directly to a peer address without waiting for mDNS discovery.
     ConnectPeer(SocketAddr),
+    /// Publish one local Call to Play action to this peer and the LAN.
+    PublishCallToPlay(CallToPlayEvent),
+    /// Request the complete in-memory Call to Play history.
+    GetCallToPlayEvents,
 }
 
 /// Optional startup settings for non-GUI callers and tests.
@@ -489,6 +497,13 @@ async fn handle_peer_commands(
             PeerCommand::ConnectPeer(addr) => {
                 handle_connect_peer_command(ctx, tx_notify_ui, addr).await;
             }
+            PeerCommand::PublishCallToPlay(event) => {
+                call_to_play::publish(ctx, tx_notify_ui, event).await;
+            }
+            PeerCommand::GetCallToPlayEvents => {
+                let events = ctx.call_to_play.read().await.snapshot();
+                events::send(tx_notify_ui, PeerEvent::CallToPlayEvents(events));
+            }
         }
     }
 }
diff --git a/crates/lanspread-peer/src/network.rs b/crates/lanspread-peer/src/network.rs
index 7609902..7d08e20 100644
--- a/crates/lanspread-peer/src/network.rs
+++ b/crates/lanspread-peer/src/network.rs
@@ -9,7 +9,7 @@ use bytes::BytesMut;
 use futures::{SinkExt, StreamExt};
 use if_addrs::{IfAddr, Interface, get_if_addrs};
 use lanspread_db::db::GameFileDescription;
-use lanspread_proto::{Hello, HelloAck, LibraryDelta, Message, Request, Response};
+use lanspread_proto::{CallToPlayEvent, Hello, HelloAck, LibraryDelta, Message, Request, Response};
 use s2n_quic::{
     Client as QuicClient,
     Connection,
@@ -173,6 +173,13 @@ pub async fn send_goodbye(peer_addr: SocketAddr, peer_id: String) -> eyre::Resul
     send_oneway_request(peer_addr, Request::Goodbye { peer_id }).await
 }
 
+pub async fn send_call_to_play_events(
+    peer_addr: SocketAddr,
+    events: Vec<CallToPlayEvent>,
+) -> eyre::Result<()> {
+    send_oneway_request(peer_addr, Request::CallToPlayEvents { events }).await
+}
+
 /// Requests game file details from a peer.
 pub async fn request_game_details_from_peer(
     peer_addr: SocketAddr,
diff --git a/crates/lanspread-peer/src/services/handshake.rs b/crates/lanspread-peer/src/services/handshake.rs
index 8680179..005e6ef 100644
--- a/crates/lanspread-peer/src/services/handshake.rs
+++ b/crates/lanspread-peer/src/services/handshake.rs
@@ -8,6 +8,7 @@ use tokio::sync::{RwLock, mpsc::UnboundedSender};
 
 use crate::{
     PeerEvent,
+    call_to_play::CallToPlayStore,
     context::{Ctx, PeerCtx},
     events,
     identity::default_features,
@@ -24,6 +25,7 @@ pub(crate) struct HandshakeCtx {
     peer_game_db: Arc<RwLock<PeerGameDB>>,
     tx_notify_ui: UnboundedSender<PeerEvent>,
     catalog: Arc<RwLock<GameCatalog>>,
+    call_to_play: Arc<RwLock<CallToPlayStore>>,
 }
 
 impl HandshakeCtx {
@@ -35,6 +37,7 @@ impl HandshakeCtx {
             peer_game_db: ctx.peer_game_db.clone(),
             tx_notify_ui: tx_notify_ui.clone(),
             catalog: ctx.catalog.clone(),
+            call_to_play: ctx.call_to_play.clone(),
         }
     }
 
@@ -46,6 +49,7 @@ impl HandshakeCtx {
             peer_game_db: ctx.peer_game_db.clone(),
             tx_notify_ui: ctx.tx_notify_ui.clone(),
             catalog: ctx.catalog.clone(),
+            call_to_play: ctx.call_to_play.clone(),
         }
     }
 }
@@ -58,28 +62,36 @@ async fn required_listen_addr(
 }
 
 pub(super) async fn build_hello_ack(ctx: &PeerCtx) -> eyre::Result<HelloAck> {
-    let library_guard = ctx.local_library.read().await;
     let listen_addr = required_listen_addr(&ctx.local_peer_addr).await?;
-    let library = build_library_snapshot(&library_guard);
+    let library = {
+        let library_guard = ctx.local_library.read().await;
+        build_library_snapshot(&library_guard)
+    };
+    let call_to_play_events = ctx.call_to_play.read().await.snapshot();
     Ok(HelloAck {
         peer_id: ctx.peer_id.as_ref().clone(),
         proto_ver: PROTOCOL_VERSION,
         listen_addr,
         library,
         features: default_features(),
+        call_to_play_events,
     })
 }
 
 async fn build_hello_from_state(ctx: &HandshakeCtx) -> eyre::Result<Hello> {
-    let library_guard = ctx.local_library.read().await;
     let listen_addr = required_listen_addr(&ctx.local_peer_addr).await?;
-    let library = build_library_snapshot(&library_guard);
+    let library = {
+        let library_guard = ctx.local_library.read().await;
+        build_library_snapshot(&library_guard)
+    };
+    let call_to_play_events = ctx.call_to_play.read().await.snapshot();
     Ok(Hello {
         peer_id: ctx.peer_id.as_ref().clone(),
         proto_ver: PROTOCOL_VERSION,
         listen_addr,
         library,
         features: default_features(),
+        call_to_play_events,
     })
 }
 
@@ -114,6 +126,13 @@ pub(crate) async fn perform_handshake_with_peer(
         let _ = ctx.peer_game_db.write().await.remove_peer(expected);
     }
 
+    merge_call_to_play_events(
+        &ctx.call_to_play,
+        &ctx.tx_notify_ui,
+        ack.call_to_play_events,
+    )
+    .await;
+
     let record_addr = ack.listen_addr;
     let upsert = record_remote_library(
         &ctx.peer_game_db,
@@ -149,6 +168,12 @@ pub(super) async fn accept_inbound_hello(
     }
 
     let addr = hello.listen_addr;
+    merge_call_to_play_events(
+        &ctx.call_to_play,
+        &ctx.tx_notify_ui,
+        hello.call_to_play_events,
+    )
+    .await;
     let handshake_ctx = HandshakeCtx::from_peer_ctx(ctx);
     let upsert = record_remote_library(
         &ctx.peer_game_db,
@@ -165,6 +190,17 @@ pub(super) async fn accept_inbound_hello(
     build_hello_ack(ctx).await
 }
 
+async fn merge_call_to_play_events(
+    store: &Arc<RwLock<CallToPlayStore>>,
+    tx_notify_ui: &UnboundedSender<PeerEvent>,
+    incoming: Vec<lanspread_proto::CallToPlayEvent>,
+) {
+    let accepted = store.write().await.insert_all(incoming);
+    if !accepted.is_empty() {
+        events::send(tx_notify_ui, PeerEvent::CallToPlayEvents(accepted));
+    }
+}
+
 pub(super) fn spawn_library_resync(
     ctx: HandshakeCtx,
     peer_addr: SocketAddr,
@@ -212,7 +248,15 @@ mod tests {
     };
 
     use lanspread_db::db::GameCatalog;
-    use lanspread_proto::{Availability, GameSummary, Hello, LibrarySnapshot, PROTOCOL_VERSION};
+    use lanspread_proto::{
+        Availability,
+        CallToPlayAction,
+        CallToPlayEvent,
+        GameSummary,
+        Hello,
+        LibrarySnapshot,
+        PROTOCOL_VERSION,
+    };
     use tokio::sync::{RwLock, mpsc};
     use tokio_util::{sync::CancellationToken, task::TaskTracker};
 
@@ -248,6 +292,7 @@ mod tests {
             peer_game_db,
             tx_notify_ui,
             catalog: Arc::new(RwLock::new(GameCatalog::empty())),
+            call_to_play: Arc::new(RwLock::new(crate::call_to_play::CallToPlayStore::default())),
         }
     }
 
@@ -264,6 +309,21 @@ mod tests {
         }
     }
 
+    fn call_to_play_event() -> CallToPlayEvent {
+        CallToPlayEvent {
+            id: "event-1".to_string(),
+            call_id: "call-1".to_string(),
+            actor: "Alice".to_string(),
+            at: 1_000,
+            action: CallToPlayAction::Create {
+                game_id: "game".to_string(),
+                max_players: 4,
+                scheduled_for: None,
+                deadline: 61_000,
+            },
+        }
+    }
+
     #[tokio::test]
     async fn outbound_hello_requires_local_listener_addr() {
         let ctx = test_handshake_ctx(None);
@@ -304,6 +364,22 @@ mod tests {
         assert_eq!(hello.library.games[0].id, "game");
     }
 
+    #[tokio::test]
+    async fn outbound_hello_carries_call_to_play_history() {
+        let ctx = test_handshake_ctx(Some(addr([10, 66, 0, 2], 40000)));
+        ctx.call_to_play
+            .write()
+            .await
+            .insert(call_to_play_event())
+            .expect("valid event should be inserted");
+
+        let hello = build_hello_from_state(&ctx)
+            .await
+            .expect("listener address is present");
+
+        assert_eq!(hello.call_to_play_events, [call_to_play_event()]);
+    }
+
     #[tokio::test]
     async fn inbound_hello_applies_remote_library_snapshot() {
         let peer_game_db = Arc::new(RwLock::new(PeerGameDB::new()));
@@ -335,6 +411,7 @@ mod tests {
                 games: vec![summary("remote-game")],
             },
             features: Vec::new(),
+            call_to_play_events: Vec::new(),
         };
 
         let ack = accept_inbound_hello(&peer_ctx, None, hello)
@@ -406,6 +483,7 @@ mod tests {
                 games: vec![summary("self-game")],
             },
             features: Vec::new(),
+            call_to_play_events: Vec::new(),
         };
 
         let ack = accept_inbound_hello(&peer_ctx, None, self_hello)
@@ -422,4 +500,49 @@ mod tests {
             "self hello must emit no peer discovery events"
         );
     }
+
+    #[tokio::test]
+    async fn inbound_hello_merges_call_to_play_history_once() {
+        let peer_game_db = Arc::new(RwLock::new(PeerGameDB::new()));
+        let ctx = Ctx::new(
+            peer_game_db,
+            "local-peer".to_string(),
+            PathBuf::new(),
+            PathBuf::new(),
+            Arc::new(NoopUnpacker),
+            CancellationToken::new(),
+            TaskTracker::new(),
+            Arc::new(RwLock::new(GameCatalog::empty())),
+            Arc::new(RwLock::new(HashMap::new())),
+            Arc::new(crate::NoopStreamInstallProvider),
+        );
+        *ctx.local_peer_addr.write().await = Some(addr([127, 0, 0, 1], 4000));
+        let (tx_notify_ui, mut rx_notify_ui) = mpsc::unbounded_channel();
+        let peer_ctx = ctx.to_peer_ctx(tx_notify_ui);
+        let remote_addr = addr([127, 0, 0, 1], 5000);
+        let hello = Hello {
+            peer_id: "remote-peer".to_string(),
+            proto_ver: PROTOCOL_VERSION,
+            listen_addr: remote_addr,
+            library: LibrarySnapshot {
+                library_rev: 0,
+                games: Vec::new(),
+            },
+            features: Vec::new(),
+            call_to_play_events: vec![call_to_play_event(), call_to_play_event()],
+        };
+
+        accept_inbound_hello(&peer_ctx, None, hello)
+            .await
+            .expect("current protocol hello should be accepted");
+
+        assert_eq!(
+            ctx.call_to_play.read().await.snapshot(),
+            [call_to_play_event()]
+        );
+        assert!(matches!(
+            rx_notify_ui.recv().await,
+            Some(PeerEvent::CallToPlayEvents(events)) if events == [call_to_play_event()]
+        ));
+    }
 }
diff --git a/crates/lanspread-peer/src/services/stream.rs b/crates/lanspread-peer/src/services/stream.rs
index 5e906fe..a8e4ede 100644
--- a/crates/lanspread-peer/src/services/stream.rs
+++ b/crates/lanspread-peer/src/services/stream.rs
@@ -90,6 +90,16 @@ async fn dispatch_request(
             handle_library_delta(ctx, peer_id, delta).await;
             framed_tx
         }
+        Request::CallToPlayEvents { events: incoming } => {
+            let accepted = ctx.call_to_play.write().await.insert_all(incoming);
+            if !accepted.is_empty() {
+                events::send(
+                    &ctx.tx_notify_ui,
+                    crate::PeerEvent::CallToPlayEvents(accepted),
+                );
+            }
+            framed_tx
+        }
         Request::GetGame { id } => handle_get_game(ctx, id, framed_tx).await,
         Request::GetGameFileData(desc) => handle_file_data_request(ctx, desc, framed_tx).await,
         Request::GetGameFileChunk {
diff --git a/crates/lanspread-proto/src/lib.rs b/crates/lanspread-proto/src/lib.rs
index 3aad2dc..c32fcf1 100644
--- a/crates/lanspread-proto/src/lib.rs
+++ b/crates/lanspread-proto/src/lib.rs
@@ -4,7 +4,7 @@ use bytes::Bytes;
 use lanspread_db::db::{Game, GameFileDescription};
 use serde::{Deserialize, Serialize};
 
-pub const PROTOCOL_VERSION: u32 = 5;
+pub const PROTOCOL_VERSION: u32 = 6;
 
 pub use lanspread_db::db::Availability;
 
@@ -27,6 +27,7 @@ pub struct Hello {
     pub listen_addr: SocketAddr,
     pub library: LibrarySnapshot,
     pub features: Vec<String>,
+    pub call_to_play_events: Vec<CallToPlayEvent>,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
@@ -36,6 +37,40 @@ pub struct HelloAck {
     pub listen_addr: SocketAddr,
     pub library: LibrarySnapshot,
     pub features: Vec<String>,
+    pub call_to_play_events: Vec<CallToPlayEvent>,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
+pub struct CallToPlayEvent {
+    pub id: String,
+    pub call_id: String,
+    pub actor: String,
+    pub at: i64,
+    pub action: CallToPlayAction,
+}
+
+#[derive(Clone, Debug, Serialize, Deserialize, PartialEq, Eq)]
+pub enum CallToPlayAction {
+    Create {
+        game_id: String,
+        max_players: u16,
+        scheduled_for: Option<i64>,
+        deadline: i64,
+    },
+    Respond {
+        ready_at: Option<i64>,
+    },
+    Rsvp,
+    SendMessage {
+        message_id: String,
+        text: String,
+    },
+    Leave,
+    Cancel,
+    Start,
+    AddTime {
+        deadline: i64,
+    },
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
@@ -75,6 +110,9 @@ pub enum Request {
         peer_id: String,
         delta: LibraryDelta,
     },
+    CallToPlayEvents {
+        events: Vec<CallToPlayEvent>,
+    },
     Goodbye {
         peer_id: String,
     },
diff --git a/crates/lanspread-tauri-deno-ts/src-tauri/Cargo.toml b/crates/lanspread-tauri-deno-ts/src-tauri/Cargo.toml
index e48222a..ea3496a 100644
--- a/crates/lanspread-tauri-deno-ts/src-tauri/Cargo.toml
+++ b/crates/lanspread-tauri-deno-ts/src-tauri/Cargo.toml
@@ -44,7 +44,7 @@ walkdir = { workspace = true }
 [build-dependencies]
 tauri-build = { version = "2", features = [] }
 
-[target.'cfg(windows)'.dependencies]
+[target."cfg(windows)".dependencies]
 windows = { workspace = true }
 
 [lints.clippy]
diff --git a/crates/lanspread-tauri-deno-ts/src-tauri/src/lib.rs b/crates/lanspread-tauri-deno-ts/src-tauri/src/lib.rs
index 4115bcd..310c93a 100644
--- a/crates/lanspread-tauri-deno-ts/src-tauri/src/lib.rs
+++ b/crates/lanspread-tauri-deno-ts/src-tauri/src/lib.rs
@@ -18,6 +18,7 @@ use lanspread_db::db::{Availability, Game, GameCatalog, GameDB, GameFileDescript
 use lanspread_peer::{
     ActiveOperation,
     ActiveOperationKind,
+    CallToPlayEvent,
     ExternalUnrarStreamProvider,
     NoopStreamInstallProvider,
     PeerCommand,
@@ -161,6 +162,7 @@ struct LauncherGame {
     game: Game,
     can_host_server: bool,
     active_outbound_transfers: usize,
+    installed_peer_count: u32,
 }
 
 #[derive(Clone, Debug, serde::Deserialize, serde::Serialize)]
@@ -272,6 +274,35 @@ async fn request_games(state: tauri::State<'_, LanSpreadState>) -> tauri::Result
     Ok(())
 }
 
+#[tauri::command]
+async fn request_call_to_play_events(
+    state: tauri::State<'_, LanSpreadState>,
+) -> tauri::Result<bool> {
+    let peer_ctrl = state.inner().peer_ctrl.read().await.clone();
+    let Some(peer_ctrl) = peer_ctrl else {
+        log::warn!("Peer system not initialized yet");
+        return Ok(false);
+    };
+
+    Ok(peer_ctrl.send(PeerCommand::GetCallToPlayEvents).is_ok())
+}
+
+#[tauri::command]
+async fn publish_call_to_play(
+    event: CallToPlayEvent,
+    state: tauri::State<'_, LanSpreadState>,
+) -> tauri::Result<bool> {
+    let peer_ctrl = state.inner().peer_ctrl.read().await.clone();
+    let Some(peer_ctrl) = peer_ctrl else {
+        log::warn!("Peer system not initialized yet");
+        return Ok(false);
+    };
+
+    Ok(peer_ctrl
+        .send(PeerCommand::PublishCallToPlay(event))
+        .is_ok())
+}
+
 #[tauri::command]
 async fn install_game(
     id: String,
@@ -1031,6 +1062,19 @@ fn clear_all_local_game_states(game_db: &mut GameDB) {
 async fn emit_games_list(app_handle: &AppHandle) {
     let state = app_handle.state::<LanSpreadState>();
 
+    let installed_peer_counts = state
+        .peer_game_db
+        .read()
+        .await
+        .peer_snapshots()
+        .into_iter()
+        .flat_map(|peer| peer.games)
+        .filter(|game| game.installed)
+        .fold(HashMap::<String, u32>::new(), |mut counts, game| {
+            *counts.entry(game.id).or_default() += 1;
+            counts
+        });
+
     let games_db_lock = state.games.clone();
     let game_db = games_db_lock.read().await;
     let games_folder = state.games_folder.read().await.clone();
@@ -1051,6 +1095,7 @@ async fn emit_games_list(app_handle: &AppHandle) {
             LauncherGame {
                 can_host_server: game_can_host_server(&games_folder, &game),
                 active_outbound_transfers,
+                installed_peer_count: installed_peer_counts.get(&game.id).copied().unwrap_or(0),
                 game,
             }
         })
@@ -2178,6 +2223,11 @@ async fn handle_peer_event(app_handle: &AppHandle, event: PeerEvent) {
             }
             emit_games_list(app_handle).await;
         }
+        PeerEvent::CallToPlayEvents(events) => {
+            if let Err(err) = app_handle.emit("call-to-play-events", Some(events)) {
+                log::error!("Failed to emit call-to-play-events event: {err}");
+            }
+        }
         PeerEvent::OutboundTransferCountChanged => {
             log::info!("PeerEvent::OutboundTransferCountChanged received");
             schedule_outbound_transfer_emit(app_handle).await;
@@ -2348,6 +2398,8 @@ pub fn run() {
         .plugin(tauri_plugin_shell::init())
         .invoke_handler(tauri::generate_handler![
             request_games,
+            request_call_to_play_events,
+            publish_call_to_play,
             install_game,
             stream_install_game,
             run_game,
diff --git a/crates/lanspread-tauri-deno-ts/src/components/Icon.tsx b/crates/lanspread-tauri-deno-ts/src/components/Icon.tsx
index 7231bea..989be54 100644
--- a/crates/lanspread-tauri-deno-ts/src/components/Icon.tsx
+++ b/crates/lanspread-tauri-deno-ts/src/components/Icon.tsx
@@ -105,4 +105,35 @@ export const Icon = {
             <path d="M5 9h2M6 8v2M10 9h.01M11 8h.01" />
         </svg>
     ),
+    flag: (p: Props) => (
+        <svg viewBox="0 0 16 16" width="13" height="13" strokeWidth={1.6} {...baseStroke} {...p}>
+            <path d="M3 14V2.5M3.5 3h8l-1.4 2.5L11.5 8h-8" />
+        </svg>
+    ),
+    clock: (p: Props) => (
+        <svg viewBox="0 0 16 16" width="13" height="13" strokeWidth={1.5} {...baseStroke} {...p}>
+            <circle cx="8" cy="8" r="5.5" />
+            <path d="M8 4.5V8l2.5 1.5" />
+        </svg>
+    ),
+    chat: (p: Props) => (
+        <svg viewBox="0 0 16 16" width="13" height="13" strokeWidth={1.5} {...baseStroke} {...p}>
+            <path d="M2.5 3.5h11v8h-6L4 14v-2.5H2.5z" />
+        </svg>
+    ),
+    send: (p: Props) => (
+        <svg viewBox="0 0 16 16" width="13" height="13" strokeWidth={1.5} {...baseStroke} {...p}>
+            <path d="m2 3 12 5-12 5 2-5zM4 8h6" />
+        </svg>
+    ),
+    caretUp: (p: Props) => (
+        <svg viewBox="0 0 16 16" width="10" height="10" strokeWidth={1.8} {...baseStroke} {...p}>
+            <path d="m4 10 4-4 4 4" />
+        </svg>
+    ),
+    caretDown: (p: Props) => (
+        <svg viewBox="0 0 16 16" width="10" height="10" strokeWidth={1.8} {...baseStroke} {...p}>
+            <path d="m4 6 4 4 4-4" />
+        </svg>
+    ),
 } satisfies Record<string, (p: Props) => JSX.Element>;
diff --git a/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayButton.tsx b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayButton.tsx
new file mode 100644
index 0000000..95240d8
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayButton.tsx
@@ -0,0 +1,18 @@
+import { Icon } from '../Icon';
+import { Nomination } from '../../lib/types';
+
+interface Props {
+    nominations: ReadonlyArray<Nomination>;
+    onClick: () => void;
+}
+
+export const CallToPlayButton = ({ nominations, onClick }: Props) => {
+    const activeCount = nominations.filter(nomination => nomination.state !== 'started').length;
+    return (
+        <button className="ctp-btn" onClick={onClick}>
+            <Icon.flag />
+            <span>Call to Play</span>
+            {activeCount > 0 && <span className="ctp-badge">{activeCount}</span>}
+        </button>
+    );
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayOverlay.tsx b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayOverlay.tsx
new file mode 100644
index 0000000..6440ab6
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayOverlay.tsx
@@ -0,0 +1,103 @@
+import { useState } from 'react';
+
+import { Icon } from '../Icon';
+import { Modal } from '../Modal';
+import { CreateNominationForm } from './CreateNominationForm';
+import { NominationCard } from './NominationCard';
+import { CallToPlayActions } from '../../hooks/useCallToPlay';
+import { Game, Nomination } from '../../lib/types';
+
+interface Props {
+    nominations: ReadonlyArray<Nomination>;
+    games: ReadonlyArray<Game>;
+    username: string;
+    actions: CallToPlayActions;
+    focusId: string | null;
+    transportReady: boolean;
+    error: string | null;
+    getThumbnail: (gameId: string) => string | null | undefined;
+    totalPeerCount: number;
+    onLaunch: (game: Game) => void;
+    onClose: () => void;
+}
+
+export const CallToPlayOverlay = ({
+    nominations,
+    games,
+    username,
+    actions,
+    focusId,
+    transportReady,
+    error,
+    getThumbnail,
+    totalPeerCount,
+    onLaunch,
+    onClose,
+}: Props) => {
+    const [showCreate, setShowCreate] = useState(false);
+    const gameById = new Map(games.map(game => [game.id, game]));
+    const sorted = [...nominations].sort((left, right) =>
+        Number(left.state === 'started') - Number(right.state === 'started')
+        || left.deadline - right.deadline
+    );
+
+    return (
+        <Modal onClose={onClose} className="ctp-modal">
+            <button className="modal-close" onClick={onClose} aria-label="Close">
+                <Icon.close />
+            </button>
+            <div className="ctp-head">
+                <h2>Call to Play</h2>
+                <p className="ctp-head-sub">
+                    Rally the LAN around a game and a time — right now, or scheduled for later with
+                    an “I’m in” RSVP. The caller decides when it actually starts.
+                </p>
+                {!showCreate && (
+                    <button
+                        className="act-btn act-play ctp-head-new"
+                        disabled={!transportReady}
+                        onClick={() => setShowCreate(true)}
+                    ><Icon.flag /><span>Call a new match</span></button>
+                )}
+                {!transportReady && !error && (
+                    <div className="ctp-transport-note">Connecting Call to Play to the LAN…</div>
+                )}
+                {error && <div className="ctp-transport-note is-error">{error}</div>}
+            </div>
+            <div className="ctp-body">
+                {showCreate && (
+                    <CreateNominationForm
+                        games={games}
+                        onCancel={() => setShowCreate(false)}
+                        onCreate={(gameId, maxPlayers, duration, scheduledFor) => {
+                            actions.createNomination(gameId, maxPlayers, duration, scheduledFor);
+                            setShowCreate(false);
+                        }}
+                    />
+                )}
+                {sorted.length === 0 && !showCreate && (
+                    <div className="ctp-empty">
+                        No active calls right now — be the one to start something.
+                    </div>
+                )}
+                {sorted.map(nomination => {
+                    const game = gameById.get(nomination.gameId);
+                    if (!game) return null;
+                    return (
+                        <NominationCard
+                            key={nomination.id}
+                            nomination={nomination}
+                            game={game}
+                            username={username}
+                            actions={actions}
+                            focused={nomination.id === focusId}
+                            thumbnailUrl={getThumbnail(game.id)}
+                            totalPeerCount={totalPeerCount}
+                            onLaunch={onLaunch}
+                        />
+                    );
+                })}
+            </div>
+        </Modal>
+    );
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayTicker.tsx b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayTicker.tsx
new file mode 100644
index 0000000..cc4aa29
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CallToPlayTicker.tsx
@@ -0,0 +1,124 @@
+import { CSSProperties } from 'react';
+
+import { Icon } from '../Icon';
+import {
+    avatarColor,
+    formatClock,
+    formatCountdown,
+    formatCountdownShort,
+    formatUntil,
+    isReady,
+    readyCountOf,
+    statusOf,
+} from '../../lib/callToPlay';
+import { Game, Nomination } from '../../lib/types';
+
+interface Props {
+    nominations: ReadonlyArray<Nomination>;
+    games: ReadonlyArray<Game>;
+    accent: string;
+    onOpen: (callId: string) => void;
+}
+
+const LABEL = {
+    scheduled: 'Scheduled',
+    call: 'Call to Play',
+    soon: 'Starting soon',
+    ready: 'Ready',
+} as const;
+
+const RANK = { ready: 0, soon: 1, call: 2, scheduled: 2, started: 3 } as const;
+
+const MiniBubbles = ({ nomination, now }: { nomination: Nomination; now: number }) => {
+    const entries = Object.entries(nomination.participants);
+    return (
+        <span className="ctp-ticker-bubbles">
+            {entries.slice(0, 6).map(([name, participant]) => {
+                const ready = isReady(participant, now);
+                const state = ready ? 'ready' : participant.status === 'in' ? 'in' : 'pending';
+                const initials = name.replace(/[^a-z0-9]/gi, '').slice(0, 2).toUpperCase();
+                const remaining = (participant.readyAt ?? now) - now;
+                return (
+                    <span
+                        key={name}
+                        className="ctp-mini"
+                        data-state={state}
+                        title={`${name} — ${ready ? 'ready' : state === 'in' ? 'in' : `ready ${formatCountdownShort(remaining)}`}`}
+                        style={{ background: avatarColor(name) }}
+                    >
+                        {initials}
+                        {ready && <span className="ctp-mini-check"><Icon.check /></span>}
+                        {state === 'pending' && (
+                            <i className="ctp-mini-tag">{formatCountdownShort(remaining)}</i>
+                        )}
+                    </span>
+                );
+            })}
+            {entries.length > 6 && <span className="ctp-mini ctp-mini-more">+{entries.length - 6}</span>}
+        </span>
+    );
+};
+
+export const CallToPlayTicker = ({ nominations, games, accent, onOpen }: Props) => {
+    const now = Date.now();
+    const gameById = new Map(games.map(game => [game.id, game]));
+    const active = nominations
+        .filter(nomination => nomination.state !== 'started')
+        .sort((left, right) =>
+            RANK[statusOf(left, now)] - RANK[statusOf(right, now)]
+            || left.deadline - right.deadline
+        );
+    if (active.length === 0) return null;
+
+    return (
+        <div className="ctp-ticker-stack">
+            {active.map(nomination => {
+                const game = gameById.get(nomination.gameId);
+                if (!game) return null;
+                const status = statusOf(nomination, now);
+                if (status === 'started') return null;
+                const ready = readyCountOf(nomination, now);
+                const total = Object.keys(nomination.participants).length;
+                const remaining = Math.max(0, nomination.deadline - now);
+                const last = nomination.messages[nomination.messages.length - 1];
+                const count = status === 'scheduled'
+                    ? `${total} in`
+                    : `${ready}/${nomination.maxPlayers} ready`;
+                const time = status === 'ready'
+                    ? 'waiting to start'
+                    : status === 'scheduled'
+                    ? `${formatClock(nomination.scheduledFor!)} · ${formatUntil(nomination.scheduledFor! - now)}`
+                    : nomination.scheduledFor !== null
+                    ? `starts ${formatClock(nomination.scheduledFor)} · ${formatCountdown(remaining)}`
+                    : formatCountdown(remaining);
+                return (
+                    <button
+                        key={nomination.id}
+                        className="ctp-ticker"
+                        data-status={status}
+                        style={{ '--accent': accent } as CSSProperties}
+                        onClick={() => onOpen(nomination.id)}
+                    >
+                        <span className="ctp-ticker-dot" data-status={status} />
+                        <span className="ctp-ticker-label" data-status={status}>{LABEL[status]}</span>
+                        <span className="ctp-ticker-game">{game.name}</span>
+                        <span className="ctp-ticker-by">by {nomination.creator}</span>
+                        <span className="ctp-ticker-ready">{count}</span>
+                        <span className="ctp-ticker-time">{time}</span>
+                        {last ? (
+                            <span className="ctp-ticker-chat" title={`${last.from}: ${last.text}`}>
+                                <Icon.chat />
+                                <b style={{ color: avatarColor(last.from) }}>{last.from}:</b>
+                                <span className="ctp-ticker-chat-text">{last.text}</span>
+                            </span>
+                        ) : <span className="ctp-ticker-chat" />}
+                        <MiniBubbles nomination={nomination} now={now} />
+                        <span className="ctp-ticker-cta">
+                            {status === 'soon' ? 'Check in' : 'View'}<Icon.chevron />
+                        </span>
+                    </button>
+                );
+            })}
+        </div>
+    );
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CreateNominationForm.tsx b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CreateNominationForm.tsx
new file mode 100644
index 0000000..b3036f9
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CreateNominationForm.tsx
@@ -0,0 +1,278 @@
+import { useLayoutEffect, useMemo, useRef, useState } from 'react';
+
+import { Icon } from '../Icon';
+import { Game } from '../../lib/types';
+import { bumpTime, normalizeTimeInput, sanitizeTimeDraft } from '../../lib/callToPlay';
+
+interface Props {
+    games: ReadonlyArray<Game>;
+    onCancel: () => void;
+    onCreate: (
+        gameId: string,
+        maxPlayers: number,
+        durationMinutes: number,
+        scheduledFor: number | null,
+    ) => void;
+}
+
+const nextTimeSlot = (): { time: string; dayOffset: number } => {
+    const now = new Date();
+    const slot = new Date(now.getTime() + 40 * 60_000);
+    slot.setMinutes(slot.getMinutes() <= 30 ? 30 : 60, 0, 0);
+    const today = new Date(now.getFullYear(), now.getMonth(), now.getDate());
+    const slotDay = new Date(slot.getFullYear(), slot.getMonth(), slot.getDate());
+    return {
+        time: `${String(slot.getHours()).padStart(2, '0')}:${String(slot.getMinutes()).padStart(2, '0')}`,
+        dayOffset: Math.round((slotDay.getTime() - today.getTime()) / 86_400_000),
+    };
+};
+
+const suggestedPlayers = (game: Game): number => Math.max(2, Math.min(64, game.max_players ?? 8));
+
+const dayChips = (): ReadonlyArray<{ offset: number; label: string }> => {
+    const days = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
+    return [0, 1, 2].map(offset => {
+        const date = new Date();
+        date.setDate(date.getDate() + offset);
+        return { offset, label: offset === 0 ? 'Today' : days[date.getDay()] };
+    });
+};
+
+export const CreateNominationForm = ({ games, onCancel, onCreate }: Props) => {
+    const [initialSchedule] = useState(nextTimeSlot);
+    const [query, setQuery] = useState('');
+    const [gameId, setGameId] = useState<string | null>(null);
+    const [maxPlayers, setMaxPlayers] = useState(8);
+    const [duration, setDuration] = useState(10);
+    const [when, setWhen] = useState<'now' | 'later'>('now');
+    const [dayOffset, setDayOffset] = useState(initialSchedule.dayOffset);
+    const [time, setTime] = useState(initialSchedule.time);
+    const [editingTime, setEditingTime] = useState(false);
+    const [timeDraft, setTimeDraft] = useState(time);
+    const timeInputRef = useRef<HTMLInputElement>(null);
+
+    useLayoutEffect(() => {
+        if (editingTime) {
+            timeInputRef.current?.focus();
+            timeInputRef.current?.select();
+        }
+    }, [editingTime]);
+
+    const selected = games.find(game => game.id === gameId);
+    const matches = useMemo(() => {
+        const needle = query.trim().toLocaleLowerCase();
+        if (!needle) return [];
+        return games.filter(game => game.name.toLocaleLowerCase().includes(needle)).slice(0, 6);
+    }, [games, query]);
+    const days = dayChips();
+
+    const pickGame = (game: Game) => {
+        setGameId(game.id);
+        setMaxPlayers(suggestedPlayers(game));
+        setQuery(game.name);
+    };
+    const scheduledTimestamp = (): number => {
+        const [hours, minutes] = time.split(':').map(Number);
+        const date = new Date();
+        date.setDate(date.getDate() + dayOffset);
+        date.setHours(hours, minutes, 0, 0);
+        return date.getTime();
+    };
+    const scheduledFor = scheduledTimestamp();
+    const scheduledTimeIsFuture = scheduledFor >= Date.now() + 60_000;
+    const commitTimeDraft = () => {
+        const normalized = normalizeTimeInput(timeDraft);
+        if (normalized) setTime(normalized);
+        setEditingTime(false);
+    };
+
+    return (
+        <div className="ctp-create">
+            <div className="ctp-create-row">
+                <label className="ctp-create-label" htmlFor="ctp-game-search">Game</label>
+                <div className="search ctp-create-search">
+                    <Icon.search />
+                    <input
+                        id="ctp-game-search"
+                        type="text"
+                        placeholder="Search the catalog…"
+                        autoComplete="off"
+                        value={query}
+                        onChange={event => {
+                            setQuery(event.target.value);
+                            setGameId(null);
+                        }}
+                    />
+                </div>
+                {!selected && query.trim() && (
+                    <div className="ctp-create-matches">
+                        {matches.map(game => (
+                            <button key={game.id} onClick={() => pickGame(game)}>
+                                <span>{game.name}</span>
+                                <span className="ctp-create-match-meta">
+                                    up to {suggestedPlayers(game)} players
+                                </span>
+                            </button>
+                        ))}
+                        {matches.length === 0 && (
+                            <div className="ctp-create-nomatch">No games match “{query}”</div>
+                        )}
+                    </div>
+                )}
+            </div>
+
+            {selected && (
+                <>
+                    <div className="ctp-create-row ctp-create-row-inline">
+                        <label className="ctp-create-label" htmlFor="ctp-max-players">Max players</label>
+                        <input
+                            id="ctp-max-players"
+                            type="number"
+                            className="ctp-create-num"
+                            min={2}
+                            max={64}
+                            value={maxPlayers}
+                            onChange={event => setMaxPlayers(
+                                Math.max(2, Math.min(64, Number(event.target.value) || 2)),
+                            )}
+                        />
+                        <span className="ctp-create-hint">
+                            Suggested for {selected.name}: {suggestedPlayers(selected)}
+                        </span>
+                    </div>
+                    <div className="ctp-create-row">
+                        <label className="ctp-create-label">When</label>
+                        <div className="ctp-duration-opts">
+                            <button
+                                className={`ctp-duration-btn ${when === 'now' ? 'is-active' : ''}`}
+                                onClick={() => setWhen('now')}
+                            >Now</button>
+                            <button
+                                className={`ctp-duration-btn ${when === 'later' ? 'is-active' : ''}`}
+                                onClick={() => setWhen('later')}
+                            >Schedule</button>
+                        </div>
+                        {when === 'later' && (
+                            <>
+                                <div className="ctp-timepick">
+                                    {editingTime ? (
+                                        <input
+                                            ref={timeInputRef}
+                                            className="ctp-time-editinput"
+                                            type="text"
+                                            inputMode="numeric"
+                                            maxLength={5}
+                                            placeholder="20:00"
+                                            value={timeDraft}
+                                            onChange={event => setTimeDraft(previous =>
+                                                sanitizeTimeDraft(event.target.value, previous)
+                                            )}
+                                            onBlur={commitTimeDraft}
+                                            onKeyDown={event => {
+                                                if (event.key === 'Enter') commitTimeDraft();
+                                                if (event.key === 'Escape') setEditingTime(false);
+                                            }}
+                                        />
+                                    ) : (
+                                        <>
+                                            <div className="ctp-timepick-field">
+                                                <button
+                                                    type="button"
+                                                    className="ctp-time-step"
+                                                    aria-label="Hour up"
+                                                    onClick={() => setTime(value => bumpTime(value, 'hours', 1))}
+                                                ><Icon.caretUp /></button>
+                                                <span className="ctp-time-cell">{time.slice(0, 2)}</span>
+                                                <button
+                                                    type="button"
+                                                    className="ctp-time-step"
+                                                    aria-label="Hour down"
+                                                    onClick={() => setTime(value => bumpTime(value, 'hours', -1))}
+                                                ><Icon.caretDown /></button>
+                                            </div>
+                                            <span className="ctp-time-colon">:</span>
+                                            <div className="ctp-timepick-field">
+                                                <button
+                                                    type="button"
+                                                    className="ctp-time-step"
+                                                    aria-label="Minute up"
+                                                    onClick={() => setTime(value => bumpTime(value, 'minutes', 15))}
+                                                ><Icon.caretUp /></button>
+                                                <span className="ctp-time-cell">{time.slice(3)}</span>
+                                                <button
+                                                    type="button"
+                                                    className="ctp-time-step"
+                                                    aria-label="Minute down"
+                                                    onClick={() => setTime(value => bumpTime(value, 'minutes', -15))}
+                                                ><Icon.caretDown /></button>
+                                            </div>
+                                            <button
+                                                type="button"
+                                                className="ctp-time-type"
+                                                onClick={() => {
+                                                    setTimeDraft(time);
+                                                    setEditingTime(true);
+                                                }}
+                                            >Type a time</button>
+                                        </>
+                                    )}
+                                </div>
+                                <div className="ctp-time-row ctp-day-row">
+                                    <span className="ctp-day-label">Day</span>
+                                    {days.map(day => (
+                                        <button
+                                            key={day.offset}
+                                            className={`ctp-duration-btn ctp-day-btn ${dayOffset === day.offset ? 'is-active' : ''}`}
+                                            onClick={() => setDayOffset(day.offset)}
+                                        >{day.label}</button>
+                                    ))}
+                                </div>
+                                <span className="ctp-create-hint">
+                                    {scheduledTimeIsFuture
+                                        ? '24-hour clock. Check-in to ready up opens 15 min before start.'
+                                        : 'Choose a time at least one minute from now.'}
+                                </span>
+                            </>
+                        )}
+                    </div>
+                    {when === 'now' && (
+                        <div className="ctp-create-row">
+                            <label className="ctp-create-label">Give people</label>
+                            <div className="ctp-duration-opts">
+                                {[5, 10, 15, 30, 60].map(minutes => (
+                                    <button
+                                        key={minutes}
+                                        className={`ctp-duration-btn ${duration === minutes ? 'is-active' : ''}`}
+                                        onClick={() => setDuration(minutes)}
+                                    >{minutes}m</button>
+                                ))}
+                            </div>
+                        </div>
+                    )}
+                    <div className="ctp-create-foot">
+                        <button className="ghost-btn" onClick={onCancel}>Cancel</button>
+                        <button
+                            className="act-btn act-play"
+                            disabled={when === 'later' && !scheduledTimeIsFuture}
+                            onClick={() => onCreate(
+                                selected.id,
+                                maxPlayers,
+                                duration,
+                                when === 'later' ? scheduledFor : null,
+                            )}
+                        >
+                            {when === 'later'
+                                ? `Schedule it — ${selected.name} · ${dayOffset > 0 ? `${days[dayOffset].label} ` : ''}${time}`
+                                : `Call it — ${selected.name}`}
+                        </button>
+                    </div>
+                </>
+            )}
+            {!selected && (
+                <div className="ctp-create-foot">
+                    <button className="ghost-btn" onClick={onCancel}>Cancel</button>
+                </div>
+            )}
+        </div>
+    );
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CtpChat.tsx b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CtpChat.tsx
new file mode 100644
index 0000000..69ed8e0
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/CtpChat.tsx
@@ -0,0 +1,91 @@
+import { useEffect, useRef, useState } from 'react';
+
+import { Icon } from '../Icon';
+import { avatarColor, formatClock } from '../../lib/callToPlay';
+import { Nomination } from '../../lib/types';
+
+interface Props {
+    nomination: Nomination;
+    username: string;
+    disabled: boolean;
+    onSend: (text: string) => void;
+}
+
+export const CtpChat = ({ nomination, username, disabled, onSend }: Props) => {
+    const [open, setOpen] = useState(false);
+    const [seen, setSeen] = useState(nomination.messages.length);
+    const [draft, setDraft] = useState('');
+    const listRef = useRef<HTMLDivElement>(null);
+
+    useEffect(() => {
+        if (open) setSeen(nomination.messages.length);
+    }, [open, nomination.messages.length]);
+    useEffect(() => {
+        if (open && listRef.current) listRef.current.scrollTop = listRef.current.scrollHeight;
+    }, [open, nomination.messages.length]);
+
+    const unread = Math.max(0, nomination.messages.length - seen);
+    const last = nomination.messages[nomination.messages.length - 1];
+    const submit = () => {
+        const text = draft.trim();
+        if (!text) return;
+        onSend(text);
+        setDraft('');
+    };
+
+    return (
+        <div className={`ctp-chat ${open ? 'is-open' : ''}`}>
+            <button className="ctp-chat-toggle" onClick={() => setOpen(value => !value)}>
+                <Icon.chat />
+                <span>Chat</span>
+                {nomination.messages.length > 0 && (
+                    <span className="ctp-chat-count">{nomination.messages.length}</span>
+                )}
+                {!open && unread > 0 && <span className="ctp-chat-unread">{unread}</span>}
+                {!open && last && (
+                    <span className="ctp-chat-preview">
+                        <b style={{ color: avatarColor(last.from) }}>{last.from}:</b> {last.text}
+                    </span>
+                )}
+                <span className="ctp-chat-chevron"><Icon.chevron /></span>
+            </button>
+            {open && (
+                <>
+                    <div className="ctp-chat-list" ref={listRef}>
+                        {nomination.messages.length === 0 && (
+                            <div className="ctp-chat-empty">No messages yet — say hi.</div>
+                        )}
+                        {nomination.messages.map(message => (
+                            <div
+                                key={message.id}
+                                className={`ctp-chat-msg ${message.from === username ? 'is-me' : ''}`}
+                            >
+                                <b style={{ color: avatarColor(message.from) }}>{message.from}</b>
+                                <span className="ctp-chat-time">{formatClock(message.at)}</span>
+                                <span className="ctp-chat-text"> {message.text}</span>
+                            </div>
+                        ))}
+                    </div>
+                    {!disabled && (
+                        <div className="ctp-chat-form">
+                            <input
+                                type="text"
+                                className="ctp-chat-input"
+                                placeholder="Message the group…"
+                                maxLength={500}
+                                value={draft}
+                                onChange={event => setDraft(event.target.value)}
+                                onKeyDown={event => {
+                                    if (event.key === 'Enter') submit();
+                                }}
+                            />
+                            <button className="ctp-chat-send" onClick={submit} aria-label="Send">
+                                <Icon.send />
+                            </button>
+                        </div>
+                    )}
+                </>
+            )}
+        </div>
+    );
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/components/calltoplay/NominationCard.tsx b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/NominationCard.tsx
new file mode 100644
index 0000000..32a9217
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/components/calltoplay/NominationCard.tsx
@@ -0,0 +1,361 @@
+import { useEffect, useRef, useState } from 'react';
+
+import { Icon } from '../Icon';
+import { GameCover } from '../grid/GameCover';
+import { CtpChat } from './CtpChat';
+import { CallToPlayActions } from '../../hooks/useCallToPlay';
+import {
+    avatarColor,
+    CHECKIN_LEAD_MS,
+    formatClock,
+    formatCountdown,
+    formatCountdownShort,
+    formatUntil,
+    inCountOf,
+    isReady,
+    phaseOf,
+    readyCountOf,
+} from '../../lib/callToPlay';
+import { CallToPlayParticipant, Game, Nomination } from '../../lib/types';
+
+interface Props {
+    nomination: Nomination;
+    game: Game;
+    username: string;
+    actions: CallToPlayActions;
+    focused: boolean;
+    thumbnailUrl?: string | null;
+    totalPeerCount: number;
+    onLaunch: (game: Game) => void;
+}
+
+const AvatarChip = ({
+    name,
+    participant,
+    now,
+}: {
+    name: string;
+    participant: CallToPlayParticipant;
+    now: number;
+}) => {
+    const ready = isReady(participant, now);
+    const isIn = !ready && participant.status === 'in';
+    const remaining = Math.max(0, (participant.readyAt ?? now) - now);
+    const initials = name.replace(/[^a-z0-9]/gi, '').slice(0, 2).toUpperCase();
+    return (
+        <div
+            className={`ctp-avatar ${ready ? 'is-ready' : isIn ? 'is-in' : 'is-pending'}`}
+            title={`${name} — ${ready ? 'ready' : isIn ? 'in, not checked in' : `ready in ${formatCountdown(remaining)}`}`}
+        >
+            <span className="ctp-avatar-dot" style={{ background: avatarColor(name) }}>{initials}</span>
+            {ready
+                ? <span className="ctp-avatar-check"><Icon.check /></span>
+                : isIn
+                ? <span className="ctp-avatar-in">in</span>
+                : <span className="ctp-avatar-pending">{formatCountdownShort(remaining)}</span>}
+        </div>
+    );
+};
+
+export const NominationCard = ({
+    nomination,
+    game,
+    username,
+    actions,
+    focused,
+    thumbnailUrl,
+    totalPeerCount,
+    onLaunch,
+}: Props) => {
+    const [confirmCancel, setConfirmCancel] = useState(false);
+    const cardRef = useRef<HTMLDivElement>(null);
+    useEffect(() => {
+        if (focused) cardRef.current?.scrollIntoView({ block: 'center', behavior: 'smooth' });
+    }, [focused]);
+
+    const now = Date.now();
+    const entries = Object.entries(nomination.participants);
+    const readyCount = readyCountOf(nomination, now);
+    const inCount = inCountOf(nomination, now);
+    const myStatus = nomination.participants[username];
+    const isMe = myStatus !== undefined;
+    const isCreator = nomination.creator === username;
+    const isDone = nomination.state === 'done';
+    const isStarted = nomination.state === 'started';
+    const phase = phaseOf(nomination, now);
+    const isScheduled = phase === 'scheduled' && !isDone && !isStarted;
+    const isCheckin = phase === 'checkin' && !isDone && !isStarted;
+    const windowStart = nomination.scheduledFor === null
+        ? nomination.createdAt
+        : nomination.scheduledFor - CHECKIN_LEAD_MS;
+    const remaining = Math.max(0, nomination.deadline - now);
+    const percentage = Math.max(
+        0,
+        Math.min(100, (remaining / Math.max(1, nomination.deadline - windowStart)) * 100),
+    );
+    const urgency = percentage < 20 ? 'high' : percentage < 50 ? 'mid' : 'low';
+    const installedCount = (game.installed_peer_count ?? game.peer_count) + (game.installed ? 1 : 0);
+    const lanCount = Math.max(totalPeerCount + 1, installedCount);
+
+    const timer = isStarted
+        ? <div className="ctp-card-timer" data-urgency="off">Launching…</div>
+        : isDone
+        ? <div className="ctp-card-timer" data-urgency="off">Ready</div>
+        : isScheduled
+        ? (
+            <div className="ctp-card-timer is-sched" data-urgency="off">
+                <span className="ctp-card-clock">{formatClock(nomination.scheduledFor!)}</span>
+                <span className="ctp-card-until">{formatUntil(nomination.scheduledFor! - now)}</span>
+            </div>
+        )
+        : isCheckin
+        ? (
+            <div className="ctp-card-timer is-sched" data-urgency={urgency}>
+                <span className="ctp-card-clock">{formatCountdown(remaining)}</span>
+                <span className="ctp-card-until">starts {formatClock(nomination.scheduledFor!)}</span>
+            </div>
+        )
+        : <div className="ctp-card-timer" data-urgency={urgency}>{formatCountdown(remaining)}</div>;
+
+    const rosterLabel = isScheduled
+        ? `${entries.length} in · up to ${nomination.maxPlayers} players`
+        : isCheckin && inCount > 0
+        ? `${readyCount}/${nomination.maxPlayers} ready · ${inCount} not checked in yet`
+        : `${readyCount}/${nomination.maxPlayers} ready`;
+
+    return (
+        <div
+            ref={cardRef}
+            className={`ctp-card ${isDone ? 'is-done' : ''} ${isStarted ? 'is-started' : ''} ${isCheckin ? 'is-checkin' : ''} ${focused ? 'is-focused' : ''}`}
+        >
+            <div className="ctp-card-top">
+                <div className="ctp-card-cover">
+                    <GameCover game={game} aspect="square" thumbnailUrl={thumbnailUrl} />
+                </div>
+                <div className="ctp-card-info">
+                    <div className="ctp-card-title">{game.name}</div>
+                    <div className="ctp-card-sub">
+                        {nomination.scheduledFor === null ? 'Called' : 'Scheduled'} by{' '}
+                        <strong>{nomination.creator}</strong>
+                        {nomination.scheduledFor !== null && ` · starts at ${formatClock(nomination.scheduledFor)}`}
+                        {` · ${installedCount}/${lanCount} peers have it installed`}
+                    </div>
+                </div>
+                {timer}
+            </div>
+
+            {isCheckin && (
+                <div className="ctp-checkin-note">
+                    <Icon.clock />
+                    <span>{isMe && myStatus.status === 'in'
+                        ? 'Starting soon — you said you’re in. Check in below.'
+                        : 'Starting soon — check-in is open.'}</span>
+                </div>
+            )}
+
+            {!isScheduled && (
+                <div className="ctp-progress">
+                    <div
+                        className="ctp-progress-fill"
+                        style={{
+                            width: `${isStarted || isDone ? 100 : percentage}%`,
+                            background: isStarted || isDone ? 'var(--ok)' : 'var(--accent)',
+                        }}
+                    />
+                </div>
+            )}
+
+            <div className="ctp-roster">
+                <div className="ctp-roster-count">{rosterLabel}</div>
+                <div className="ctp-avatars">
+                    {entries.map(([name, participant]) => (
+                        <AvatarChip key={name} name={name} participant={participant} now={now} />
+                    ))}
+                    {Array.from({ length: Math.max(0, nomination.maxPlayers - entries.length) })
+                        .map((_, index) => (
+                            <div key={index} className="ctp-avatar ctp-avatar-empty" />
+                        ))}
+                </div>
+            </div>
+
+            <div className="ctp-actions">
+                <CardActions
+                    nomination={nomination}
+                    game={game}
+                    username={username}
+                    actions={actions}
+                    onLaunch={onLaunch}
+                    now={now}
+                />
+            </div>
+
+            <CtpChat
+                nomination={nomination}
+                username={username}
+                disabled={isStarted}
+                onSend={text => actions.sendMessage(nomination.id, text)}
+            />
+
+            {isCreator && !isStarted && (
+                confirmCancel
+                    ? (
+                        <div className="ctp-cancel-confirm">
+                            <span>Cancel this call for everyone?</span>
+                            <div className="ctp-cancel-confirm-btns">
+                                <button
+                                    className="ghost-btn ghost-danger"
+                                    onClick={() => actions.cancel(nomination.id)}
+                                >Yes, cancel it</button>
+                                <button className="ghost-btn" onClick={() => setConfirmCancel(false)}>
+                                    No, keep it
+                                </button>
+                            </div>
+                        </div>
+                    )
+                    : (
+                        <button className="ctp-cancel-link" onClick={() => setConfirmCancel(true)}>
+                            <Icon.trash /><span>Cancel this call</span>
+                        </button>
+                    )
+            )}
+        </div>
+    );
+};
+
+interface CardActionsProps {
+    nomination: Nomination;
+    game: Game;
+    username: string;
+    actions: CallToPlayActions;
+    onLaunch: (game: Game) => void;
+    now: number;
+}
+
+const ReadyButtons = ({ nomination, actions, includeThirty = false }: {
+    nomination: Nomination;
+    actions: CallToPlayActions;
+    includeThirty?: boolean;
+}) => (
+    <>
+        <button className="act-btn act-play" onClick={() => actions.respond(nomination.id, 'ready')}>
+            <Icon.play /><span>Ready now</span>
+        </button>
+        <div className="ctp-buffer-group">
+            {[5, 10, 15, ...(includeThirty ? [30] : [])].map(minutes => (
+                <button
+                    key={minutes}
+                    className="ctp-buffer-btn"
+                    onClick={() => actions.respond(nomination.id, minutes)}
+                >+{minutes}m</button>
+            ))}
+        </div>
+    </>
+);
+
+const CardActions = ({
+    nomination,
+    game,
+    username,
+    actions,
+    onLaunch,
+    now,
+}: CardActionsProps) => {
+    const myStatus = nomination.participants[username];
+    const isMe = myStatus !== undefined;
+    const isCreator = nomination.creator === username;
+    const isDone = nomination.state === 'done';
+    const isStarted = nomination.state === 'started';
+    const scheduled = phaseOf(nomination, now) === 'scheduled' && !isDone && !isStarted;
+    const readyCount = readyCountOf(nomination, now);
+
+    if (isStarted) {
+        return <div className="ctp-note ctp-note-launch">Launching {game.name}…</div>;
+    }
+    if (scheduled) {
+        if (isCreator) {
+            return (
+                <div className="ctp-note">
+                    Scheduled for {formatClock(nomination.scheduledFor!)} — check-in opens 15 min before start.
+                </div>
+            );
+        }
+        if (isMe) {
+            return (
+                <>
+                    <div className="ctp-me-status">You’re in — we’ll nudge you when check-in opens</div>
+                    <button className="ghost-btn ghost-danger" onClick={() => actions.leave(nomination.id)}>
+                        Can’t make it
+                    </button>
+                </>
+            );
+        }
+        return (
+            <>
+                <button className="act-btn act-play" onClick={() => actions.rsvp(nomination.id)}>
+                    <Icon.check /><span>I’m in</span>
+                </button>
+                <div className="ctp-note">Check-in opens 15 min before start</div>
+            </>
+        );
+    }
+    if (isCreator) {
+        if (isDone) {
+            return (
+                <>
+                    <button
+                        className="act-btn act-play"
+                        onClick={() => void actions.startNow(nomination.id).then(accepted => {
+                            if (accepted) onLaunch(game);
+                        })}
+                    ><Icon.play /><span>Start now</span></button>
+                    <button className="ghost-btn" onClick={() => actions.addTime(nomination.id)}>
+                        Add 5 more minutes
+                    </button>
+                </>
+            );
+        }
+        if (myStatus?.status === 'in') {
+            return <ReadyButtons nomination={nomination} actions={actions} />;
+        }
+        return <div className="ctp-note">Waiting for players to ready up…</div>;
+    }
+    if (isDone) {
+        return (
+            <div className="ctp-note">
+                {readyCount >= nomination.maxPlayers
+                    ? 'Everyone’s ready.'
+                    : `It’s time — waiting for ${nomination.creator} to start.`}
+            </div>
+        );
+    }
+    if (isMe) {
+        if (myStatus.status === 'in') {
+            return (
+                <>
+                    <div className="ctp-me-status">You said you’re in — check in:</div>
+                    <ReadyButtons nomination={nomination} actions={actions} />
+                    <button className="ghost-btn ghost-danger" onClick={() => actions.leave(nomination.id)}>
+                        Leave
+                    </button>
+                </>
+            );
+        }
+        const ready = isReady(myStatus, now);
+        return (
+            <>
+                <div className="ctp-me-status">
+                    {ready ? 'You’re in — ready' : `You: ready in ${formatCountdown((myStatus.readyAt ?? now) - now)}`}
+                </div>
+                {!ready && (
+                    <button className="ghost-btn" onClick={() => actions.respond(nomination.id, 'ready')}>
+                        I’m ready now
+                    </button>
+                )}
+                <button className="ghost-btn ghost-danger" onClick={() => actions.leave(nomination.id)}>
+                    Leave
+                </button>
+            </>
+        );
+    }
+    return <ReadyButtons nomination={nomination} actions={actions} includeThirty />;
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/components/topbar/TopBar.tsx b/crates/lanspread-tauri-deno-ts/src/components/topbar/TopBar.tsx
index 3cec4f4..f96b117 100644
--- a/crates/lanspread-tauri-deno-ts/src/components/topbar/TopBar.tsx
+++ b/crates/lanspread-tauri-deno-ts/src/components/topbar/TopBar.tsx
@@ -3,9 +3,10 @@ import { SegmentedFilters } from './SegmentedFilters';
 import { SearchField } from './SearchField';
 import { SortMenu } from './SortMenu';
 import { KebabMenu, KebabItem } from './KebabMenu';
+import { CallToPlayButton } from '../calltoplay/CallToPlayButton';
 
 import { FilterCounts } from '../../lib/gameState';
-import { GameFilter, GameSort } from '../../lib/types';
+import { GameFilter, GameSort, Nomination } from '../../lib/types';
 
 interface Props {
     accent: string;
@@ -18,6 +19,8 @@ interface Props {
     sort: GameSort;
     setSort: (value: GameSort) => void;
     kebabItems: ReadonlyArray<KebabItem>;
+    nominations: ReadonlyArray<Nomination>;
+    onOpenCallToPlay: () => void;
 }
 
 export const TopBar = ({
@@ -31,6 +34,8 @@ export const TopBar = ({
     sort,
     setSort,
     kebabItems,
+    nominations,
+    onOpenCallToPlay,
 }: Props) => (
     <header className="topbar">
         <div className="topbar-left">
@@ -47,6 +52,7 @@ export const TopBar = ({
                 <SortMenu value={sort} onChange={setSort} />
             </div>
             <div className="topbar-right-tail">
+                <CallToPlayButton nominations={nominations} onClick={onOpenCallToPlay} />
                 <KebabMenu items={kebabItems} />
             </div>
         </div>
diff --git a/crates/lanspread-tauri-deno-ts/src/hooks/useCallToPlay.ts b/crates/lanspread-tauri-deno-ts/src/hooks/useCallToPlay.ts
new file mode 100644
index 0000000..83be4c2
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/hooks/useCallToPlay.ts
@@ -0,0 +1,173 @@
+import { useCallback, useEffect, useMemo, useState } from 'react';
+import { invoke } from '@tauri-apps/api/core';
+import { listen, UnlistenFn } from '@tauri-apps/api/event';
+
+import { callToPlayEvent, reduceCallToPlayEvents } from '../lib/callToPlay';
+import { CallToPlayAction, CallToPlayEvent, Nomination } from '../lib/types';
+
+export interface CallToPlayActions {
+    createNomination: (
+        gameId: string,
+        maxPlayers: number,
+        durationMinutes: number,
+        scheduledFor: number | null,
+    ) => void;
+    respond: (callId: string, choice: 'ready' | number) => void;
+    rsvp: (callId: string) => void;
+    sendMessage: (callId: string, text: string) => void;
+    leave: (callId: string) => void;
+    cancel: (callId: string) => void;
+    startNow: (callId: string) => Promise<boolean>;
+    addTime: (callId: string, minutes?: number) => void;
+}
+
+export interface UseCallToPlay {
+    nominations: Nomination[];
+    actions: CallToPlayActions;
+    username: string;
+    transportReady: boolean;
+    error: string | null;
+}
+
+const mergeEvents = (
+    previous: ReadonlyMap<string, CallToPlayEvent>,
+    incoming: ReadonlyArray<CallToPlayEvent>,
+): Map<string, CallToPlayEvent> => {
+    const next = new Map(previous);
+    for (const event of incoming) next.set(event.id, event);
+    return next;
+};
+
+export const useCallToPlay = (username: string): UseCallToPlay => {
+    const actor = useMemo(() => {
+        const trimmed = username.trim();
+        return trimmed ? Array.from(trimmed).slice(0, 24).join('') : 'Commander';
+    }, [username]);
+    const [events, setEvents] = useState<ReadonlyMap<string, CallToPlayEvent>>(() => new Map());
+    const [now, setNow] = useState(Date.now());
+    const [transportReady, setTransportReady] = useState(false);
+    const [error, setError] = useState<string | null>(null);
+
+    useEffect(() => {
+        const timer = window.setInterval(() => setNow(Date.now()), 1_000);
+        return () => window.clearInterval(timer);
+    }, []);
+
+    useEffect(() => {
+        let cancelled = false;
+        let unlisten: UnlistenFn | undefined;
+        let retry: number | undefined;
+
+        const requestSnapshot = async (): Promise<boolean> => {
+            try {
+                const ready = await invoke<boolean>('request_call_to_play_events');
+                if (cancelled) return false;
+                setTransportReady(ready);
+                if (ready && retry !== undefined) {
+                    window.clearInterval(retry);
+                    retry = undefined;
+                }
+                return ready;
+            } catch (err) {
+                if (!cancelled) {
+                    setTransportReady(false);
+                    console.error('request_call_to_play_events failed:', err);
+                }
+                return false;
+            }
+        };
+
+        const register = async () => {
+            try {
+                unlisten = await listen<CallToPlayEvent[]>('call-to-play-events', event => {
+                    setEvents(previous => mergeEvents(previous, event.payload));
+                });
+                if (cancelled) {
+                    unlisten();
+                    return;
+                }
+                const ready = await requestSnapshot();
+                if (!cancelled && !ready) {
+                    retry = window.setInterval(() => void requestSnapshot(), 2_000);
+                }
+            } catch (err) {
+                console.error('Failed to register Call to Play listener:', err);
+                if (!cancelled) setError('Call to Play networking is unavailable.');
+            }
+        };
+
+        void register();
+        return () => {
+            cancelled = true;
+            unlisten?.();
+            if (retry !== undefined) window.clearInterval(retry);
+        };
+    }, []);
+
+    const publish = useCallback(async (
+        callId: string,
+        action: CallToPlayAction,
+    ): Promise<boolean> => {
+        const event = callToPlayEvent(callId, actor, action);
+        try {
+            const accepted = await invoke<boolean>('publish_call_to_play', { event });
+            if (!accepted) {
+                setTransportReady(false);
+                setError('Call to Play needs an active LAN peer. Choose a game folder first.');
+                return false;
+            }
+            setTransportReady(true);
+            setError(null);
+            return true;
+        } catch (err) {
+            console.error('publish_call_to_play failed:', err);
+            setError('Could not send this Call to Play update.');
+            return false;
+        }
+    }, [actor]);
+
+    const actions = useMemo<CallToPlayActions>(() => ({
+        createNomination: (gameId, maxPlayers, durationMinutes, scheduledFor) => {
+            const createdAt = Date.now();
+            const callId = globalThis.crypto.randomUUID();
+            const deadline = scheduledFor ?? createdAt + durationMinutes * 60_000;
+            void publish(callId, {
+                Create: {
+                    game_id: gameId,
+                    max_players: Math.max(2, Math.min(64, Math.round(maxPlayers))),
+                    scheduled_for: scheduledFor,
+                    deadline,
+                },
+            });
+        },
+        respond: (callId, choice) => void publish(callId, {
+            Respond: {
+                ready_at: choice === 'ready' ? null : Date.now() + choice * 60_000,
+            },
+        }),
+        rsvp: callId => void publish(callId, 'Rsvp'),
+        sendMessage: (callId, text) => {
+            const trimmed = text.trim().slice(0, 500);
+            if (!trimmed) return;
+            void publish(callId, {
+                SendMessage: {
+                    message_id: globalThis.crypto.randomUUID(),
+                    text: trimmed,
+                },
+            });
+        },
+        leave: callId => void publish(callId, 'Leave'),
+        cancel: callId => void publish(callId, 'Cancel'),
+        startNow: callId => publish(callId, 'Start'),
+        addTime: (callId, minutes = 5) => void publish(callId, {
+            AddTime: { deadline: Date.now() + minutes * 60_000 },
+        }),
+    }), [publish]);
+
+    const nominations = useMemo(
+        () => reduceCallToPlayEvents([...events.values()], now),
+        [events, now],
+    );
+
+    return { nominations, actions, username: actor, transportReady, error };
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/lib/callToPlay.ts b/crates/lanspread-tauri-deno-ts/src/lib/callToPlay.ts
new file mode 100644
index 0000000..0b3925d
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/src/lib/callToPlay.ts
@@ -0,0 +1,290 @@
+import {
+    CallToPlayAction,
+    CallToPlayEvent,
+    CallToPlayParticipant,
+    Nomination,
+} from './types';
+
+export const CHECKIN_LEAD_MS = 15 * 60_000;
+export const STARTED_RETENTION_MS = 3_000;
+
+export type CallToPlayPhase = 'now' | 'scheduled' | 'checkin';
+export type CallToPlayStatus = 'started' | 'ready' | 'soon' | 'scheduled' | 'call';
+
+interface MutableNomination extends Nomination {
+    cancelled: boolean;
+    messageIds: Set<string>;
+}
+
+const compareEvents = (a: CallToPlayEvent, b: CallToPlayEvent): number =>
+    a.at - b.at || a.id.localeCompare(b.id);
+
+type CreatePayload = Extract<CallToPlayAction, { Create: unknown }>['Create'];
+type RespondPayload = Extract<CallToPlayAction, { Respond: unknown }>['Respond'];
+type MessagePayload = Extract<CallToPlayAction, { SendMessage: unknown }>['SendMessage'];
+type AddTimePayload = Extract<CallToPlayAction, { AddTime: unknown }>['AddTime'];
+
+const createPayload = (action: CallToPlayAction): CreatePayload | null =>
+    typeof action === 'object' && 'Create' in action ? action.Create : null;
+const respondPayload = (action: CallToPlayAction): RespondPayload | null =>
+    typeof action === 'object' && 'Respond' in action ? action.Respond : null;
+const messagePayload = (action: CallToPlayAction): MessagePayload | null =>
+    typeof action === 'object' && 'SendMessage' in action ? action.SendMessage : null;
+const addTimePayload = (action: CallToPlayAction): AddTimePayload | null =>
+    typeof action === 'object' && 'AddTime' in action ? action.AddTime : null;
+
+export const phaseOf = (nomination: Nomination, now: number): CallToPlayPhase => {
+    if (nomination.scheduledFor === null) return 'now';
+    return now < nomination.scheduledFor - CHECKIN_LEAD_MS ? 'scheduled' : 'checkin';
+};
+
+export const isReady = (
+    participant: CallToPlayParticipant | undefined,
+    now: number,
+): boolean => Boolean(
+    participant && (
+        participant.status === 'ready'
+        || (participant.readyAt !== undefined && now >= participant.readyAt)
+    ),
+);
+
+export const readyCountOf = (nomination: Nomination, now: number): number =>
+    Object.values(nomination.participants).filter(participant => isReady(participant, now)).length;
+
+export const inCountOf = (nomination: Nomination, now: number): number =>
+    Object.values(nomination.participants).filter(participant =>
+        !isReady(participant, now) && participant.status === 'in'
+    ).length;
+
+export const statusOf = (nomination: Nomination, now: number): CallToPlayStatus => {
+    if (nomination.state === 'started') return 'started';
+    if (nomination.state === 'done' || readyCountOf(nomination, now) >= nomination.maxPlayers) {
+        return 'ready';
+    }
+    if (nomination.deadline - now <= CHECKIN_LEAD_MS) return 'soon';
+    return nomination.scheduledFor === null ? 'call' : 'scheduled';
+};
+
+export const reduceCallToPlayEvents = (
+    input: ReadonlyArray<CallToPlayEvent>,
+    now: number,
+): Nomination[] => {
+    const unique = new Map(input.map(event => [event.id, event]));
+    const byCall = new Map<string, CallToPlayEvent[]>();
+    for (const event of unique.values()) {
+        const events = byCall.get(event.call_id) ?? [];
+        events.push(event);
+        byCall.set(event.call_id, events);
+    }
+
+    const nominations: Nomination[] = [];
+    for (const events of byCall.values()) {
+        events.sort(compareEvents);
+        const create = events.find(event => createPayload(event.action) !== null);
+        if (!create) continue;
+        const payload = createPayload(create.action);
+        if (!payload) continue;
+
+        const nomination: MutableNomination = {
+            id: create.call_id,
+            gameId: payload.game_id,
+            creator: create.actor,
+            maxPlayers: payload.max_players,
+            createdAt: create.at,
+            scheduledFor: payload.scheduled_for,
+            deadline: payload.deadline,
+            participants: {
+                [create.actor]: {
+                    status: payload.scheduled_for === null ? 'ready' : 'in',
+                    joinedAt: create.at,
+                },
+            },
+            messages: [],
+            state: 'open',
+            cancelled: false,
+            messageIds: new Set(),
+        };
+
+        for (const event of events) {
+            if (compareEvents(event, create) <= 0 || nomination.cancelled) continue;
+            applyEvent(nomination, event);
+        }
+
+        if (nomination.cancelled) continue;
+        if (nomination.state === 'open'
+            && (readyCountOf(nomination, now) >= nomination.maxPlayers || now >= nomination.deadline)
+        ) {
+            nomination.state = 'done';
+        }
+        if (nomination.state === 'started'
+            && now - (nomination.startedAt ?? now) > STARTED_RETENTION_MS
+        ) {
+            continue;
+        }
+
+        const { cancelled: _, messageIds: __, ...result } = nomination;
+        nominations.push(result);
+    }
+
+    return nominations.sort((a, b) => b.createdAt - a.createdAt || a.id.localeCompare(b.id));
+};
+
+const applyEvent = (nomination: MutableNomination, event: CallToPlayEvent): void => {
+    const action = event.action;
+    if (typeof action === 'string') {
+        applyUnitAction(nomination, event, action);
+        return;
+    }
+
+    const response = respondPayload(action);
+    if (response) {
+        if (nomination.state === 'started') return;
+        const existing = nomination.participants[event.actor];
+        nomination.participants[event.actor] = {
+            status: response.ready_at === null ? 'ready' : 'pending',
+            joinedAt: existing?.joinedAt ?? event.at,
+            ...(response.ready_at === null ? {} : { readyAt: response.ready_at }),
+        };
+        return;
+    }
+
+    const message = messagePayload(action);
+    if (message && nomination.state !== 'started' && !nomination.messageIds.has(message.message_id)) {
+        nomination.messageIds.add(message.message_id);
+        nomination.messages.push({
+            id: message.message_id,
+            from: event.actor,
+            text: message.text,
+            at: event.at,
+        });
+        nomination.messages.sort((a, b) => a.at - b.at || a.id.localeCompare(b.id));
+        return;
+    }
+
+    const extension = addTimePayload(action);
+    if (extension && event.actor === nomination.creator && nomination.state !== 'started') {
+        nomination.deadline = extension.deadline;
+        nomination.state = 'open';
+    }
+};
+
+const applyUnitAction = (
+    nomination: MutableNomination,
+    event: CallToPlayEvent,
+    action: Extract<CallToPlayAction, string>,
+): void => {
+    switch (action) {
+        case 'Rsvp': {
+            if (nomination.state === 'started') return;
+            const existing = nomination.participants[event.actor];
+            nomination.participants[event.actor] = {
+                status: 'in',
+                joinedAt: existing?.joinedAt ?? event.at,
+            };
+            break;
+        }
+        case 'Leave':
+            if (event.actor !== nomination.creator && nomination.state !== 'started') {
+                delete nomination.participants[event.actor];
+            }
+            break;
+        case 'Cancel':
+            if (event.actor === nomination.creator && nomination.state !== 'started') {
+                nomination.cancelled = true;
+            }
+            break;
+        case 'Start':
+            if (event.actor === nomination.creator && nomination.state !== 'started') {
+                nomination.state = 'started';
+                nomination.startedAt = event.at;
+            }
+            break;
+    }
+};
+
+export const callToPlayEvent = (
+    callId: string,
+    actor: string,
+    action: CallToPlayAction,
+    at = Date.now(),
+): CallToPlayEvent => ({
+    id: globalThis.crypto.randomUUID(),
+    call_id: callId,
+    actor,
+    at,
+    action,
+});
+
+export const formatClock = (timestamp: number): string => {
+    const date = new Date(timestamp);
+    return `${String(date.getHours()).padStart(2, '0')}:${String(date.getMinutes()).padStart(2, '0')}`;
+};
+
+export const formatCountdown = (milliseconds: number): string => {
+    if (milliseconds <= 0) return '0:00';
+    const total = Math.ceil(milliseconds / 1_000);
+    return `${Math.floor(total / 60)}:${String(total % 60).padStart(2, '0')}`;
+};
+
+export const formatCountdownShort = (milliseconds: number): string => {
+    if (milliseconds <= 0) return 'now';
+    const total = Math.ceil(milliseconds / 1_000);
+    return total < 60 ? `${total}s` : `${Math.ceil(total / 60)}m`;
+};
+
+export const formatUntil = (milliseconds: number): string => {
+    if (milliseconds <= 60_000) return 'in <1 min';
+    const minutes = Math.round(milliseconds / 60_000);
+    if (minutes < 60) return `in ${minutes} min`;
+    const hours = Math.floor(minutes / 60);
+    const remainder = minutes % 60;
+    return remainder ? `in ${hours}h ${remainder}m` : `in ${hours}h`;
+};
+
+const AVATAR_COLORS = [
+    '#60a5fa', '#34d399', '#c084fc', '#fbbf24',
+    '#f472b6', '#38bdf8', '#a3e635', '#fb7185',
+];
+
+export const avatarColor = (name: string): string => {
+    const hash = Array.from(name).reduce((sum, character) => sum + character.charCodeAt(0), 0);
+    return AVATAR_COLORS[hash % AVATAR_COLORS.length];
+};
+
+export const sanitizeTimeDraft = (raw: string, previous: string): string => {
+    const value = raw.replace(/[^\d:]/g, '');
+    if ((value.match(/:/g) ?? []).length > 1) return previous;
+    const colon = value.indexOf(':');
+    if (colon !== -1) {
+        if (value.slice(0, colon).length > 2 || value.slice(colon + 1).length > 2) {
+            return previous;
+        }
+        return value;
+    }
+    return value.length > 4 ? previous : value;
+};
+
+export const normalizeTimeInput = (raw: string): string | null => {
+    const match = raw.trim().match(/^(\d{1,2})(?:[:.\s]?(\d{2}))?$/);
+    if (!match) return null;
+    const hours = Number(match[1]);
+    const minutes = Number(match[2] ?? 0);
+    if (hours > 23 || minutes > 59) return null;
+    return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}`;
+};
+
+export const bumpTime = (
+    time: string,
+    field: 'hours' | 'minutes',
+    delta: number,
+): string => {
+    let [hours, minutes] = time.split(':').map(Number);
+    if (field === 'hours') {
+        hours = (hours + delta + 24) % 24;
+    } else {
+        const total = ((hours * 60 + minutes + delta) % 1_440 + 1_440) % 1_440;
+        hours = Math.floor(total / 60);
+        minutes = total % 60;
+    }
+    return `${String(hours).padStart(2, '0')}:${String(minutes).padStart(2, '0')}`;
+};
diff --git a/crates/lanspread-tauri-deno-ts/src/lib/types.ts b/crates/lanspread-tauri-deno-ts/src/lib/types.ts
index fd9ec4f..83f95e6 100644
--- a/crates/lanspread-tauri-deno-ts/src/lib/types.ts
+++ b/crates/lanspread-tauri-deno-ts/src/lib/types.ts
@@ -60,6 +60,7 @@ export interface Game {
     peer_count: number;
     can_host_server?: boolean;
     active_outbound_transfers?: number;
+    installed_peer_count?: number;
 }
 
 export interface ActiveOperation {
@@ -83,3 +84,50 @@ export type DerivedState = 'installed' | 'local' | 'downloading' | 'none' | 'bus
 
 /** Two-character language code passed through to game scripts. */
 export type LauncherLanguage = 'en' | 'de';
+
+export type CallToPlayParticipantStatus = 'ready' | 'in' | 'pending';
+
+export interface CallToPlayParticipant {
+    status: CallToPlayParticipantStatus;
+    joinedAt: number;
+    readyAt?: number;
+}
+
+export interface CallToPlayMessage {
+    id: string;
+    from: string;
+    text: string;
+    at: number;
+}
+
+export interface Nomination {
+    id: string;
+    gameId: string;
+    creator: string;
+    maxPlayers: number;
+    createdAt: number;
+    scheduledFor: number | null;
+    deadline: number;
+    participants: Record<string, CallToPlayParticipant>;
+    messages: CallToPlayMessage[];
+    state: 'open' | 'done' | 'started';
+    startedAt?: number;
+}
+
+export type CallToPlayAction =
+    | { Create: { game_id: string; max_players: number; scheduled_for: number | null; deadline: number } }
+    | { Respond: { ready_at: number | null } }
+    | 'Rsvp'
+    | { SendMessage: { message_id: string; text: string } }
+    | 'Leave'
+    | 'Cancel'
+    | 'Start'
+    | { AddTime: { deadline: number } };
+
+export interface CallToPlayEvent {
+    id: string;
+    call_id: string;
+    actor: string;
+    at: number;
+    action: CallToPlayAction;
+}
diff --git a/crates/lanspread-tauri-deno-ts/src/styles/launcher.css b/crates/lanspread-tauri-deno-ts/src/styles/launcher.css
index e5c6947..6093935 100644
--- a/crates/lanspread-tauri-deno-ts/src/styles/launcher.css
+++ b/crates/lanspread-tauri-deno-ts/src/styles/launcher.css
@@ -1783,3 +1783,645 @@
   background: var(--accent);
   border-color: transparent;
 }
+
+/* ═══════════════════════════════════════════════════════════════════
+   Call to Play — rally a game + a time
+   ═══════════════════════════════════════════════════════════════════ */
+
+/* ─── Top-bar entry button ─── */
+.ctp-btn {
+  position: relative;
+  display: inline-flex; align-items: center; gap: 8px;
+  height: 36px; padding: 0 14px;
+  background: color-mix(in srgb, var(--accent) 14%, var(--bg-2));
+  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--bd-2));
+  border-radius: 8px;
+  color: var(--t-1);
+  font: inherit; font-size: 12.5px; font-weight: 700;
+  cursor: pointer;
+  white-space: nowrap;
+  flex-shrink: 0;
+  transition: background .15s, border-color .15s;
+}
+.ctp-btn svg { color: var(--accent); flex-shrink: 0; }
+.ctp-btn:hover {
+  background: color-mix(in srgb, var(--accent) 22%, var(--bg-2));
+  border-color: color-mix(in srgb, var(--accent) 65%, var(--bd-2));
+}
+.ctp-badge {
+  display: inline-grid; place-items: center;
+  min-width: 18px; height: 18px;
+  padding: 0 5px;
+  border-radius: 999px;
+  background: var(--accent);
+  color: white;
+  font-size: 10.5px; font-weight: 800;
+  font-variant-numeric: tabular-nums;
+}
+
+/* ─── Ticker strip ─── */
+.ctp-ticker-stack {
+  display: flex; flex-direction: column; gap: 8px;
+  margin-bottom: 14px;
+}
+.ctp-ticker-stack .ctp-ticker { margin-bottom: 0; }
+.ctp-ticker {
+  display: grid;
+  grid-template-columns:
+    10px      /* LED */
+    98px      /* status */
+    220px     /* game */
+    130px     /* by */
+    88px      /* count */
+    170px     /* time */
+    minmax(0, 1fr)  /* chat — sole flexible track, absorbs bubbles variance */
+    max-content     /* bubbles */
+    82px;     /* cta */
+  align-items: center;
+  column-gap: 12px;
+  width: 100%;
+  padding: 10px 16px;
+  background: color-mix(in srgb, var(--accent) 10%, var(--bg-2));
+  border: 1px solid color-mix(in srgb, var(--accent) 35%, var(--bd-2));
+  border-radius: 10px;
+  color: var(--t-1);
+  font: inherit; font-size: 12.5px;
+  cursor: pointer;
+  text-align: left;
+  transition: background .15s, border-color .15s;
+}
+.ctp-ticker:hover { background: color-mix(in srgb, var(--accent) 16%, var(--bg-2)); }
+.ctp-ticker-dot {
+  width: 8px; height: 8px; border-radius: 999px; flex-shrink: 0;
+  background: var(--accent);
+  box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 60%, transparent);
+  animation: ctp-tickerpulse 1.6s ease-out infinite;
+}
+@keyframes ctp-tickerpulse {
+  0%   { box-shadow: 0 0 0 0   color-mix(in srgb, var(--accent) 55%, transparent); }
+  70%  { box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent) 0%,  transparent); }
+  100% { box-shadow: 0 0 0 0   color-mix(in srgb, var(--accent) 0%,  transparent); }
+}
+.ctp-ticker-label {
+  font-weight: 700;
+  color: var(--accent);
+  text-transform: uppercase;
+  font-size: 10.5px;
+  letter-spacing: 0.06em;
+  flex-shrink: 0;
+}
+.ctp-ticker-game { font-weight: 700; color: var(--t-1); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.ctp-ticker-by { color: var(--t-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.ctp-ticker-sep { display: none; }
+.ctp-ticker-ready, .ctp-ticker-time { color: var(--t-2); font-variant-numeric: tabular-nums; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.ctp-ticker-more {
+  color: var(--t-3);
+  font-size: 11.5px;
+  flex-shrink: 0;
+}
+.ctp-ticker-cta {
+  display: inline-flex; align-items: center; justify-content: flex-end; gap: 4px;
+  font-weight: 700;
+  color: var(--accent);
+}
+.ctp-ticker-cta svg { transform: rotate(-90deg); }
+
+/* ─── Overlay modal ─── */
+.ctp-modal { width: min(720px, 100%); }
+.ctp-head-row {
+  display: flex; align-items: center; justify-content: space-between;
+  gap: 12px;
+  margin-right: 36px;
+}
+.ctp-head-new { height: 40px; padding: 0 18px; font-size: 13px; margin-top: 14px; width: 100%; }
+.ctp-head { padding: 26px 28px 14px; border-bottom: 1px solid var(--bd-1); }
+.ctp-head h2 { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: -0.01em; color: var(--t-1); }
+.ctp-head-sub { margin: 6px 0 0; font-size: 12.5px; color: var(--t-3); max-width: 52ch; }
+.ctp-body {
+  padding: 18px 24px 24px;
+  display: flex; flex-direction: column; gap: 14px;
+  max-height: 66vh;
+  overflow: auto;
+}
+.ctp-empty {
+  padding: 28px 8px;
+  text-align: center;
+  color: var(--t-3);
+  font-size: 13px;
+}
+
+/* ─── Nomination card ─── */
+.ctp-card {
+  display: flex; flex-direction: column; gap: 12px;
+  padding: 14px;
+  background: rgba(255,255,255,0.025);
+  border: 1px solid var(--bd-1);
+  border-radius: 12px;
+}
+.ctp-card.is-done { border-color: color-mix(in srgb, var(--ok) 45%, var(--bd-2)); }
+.ctp-card.is-started { opacity: 0.6; }
+.ctp-card.is-focused { border-color: var(--accent); animation: ctp-cardflash 1.4s ease-out 1; }
+@keyframes ctp-cardflash {
+  0%   { box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 55%, transparent); }
+  100% { box-shadow: 0 0 0 0   color-mix(in srgb, var(--accent) 0%, transparent); }
+}
+.ctp-card-top { display: flex; align-items: flex-start; gap: 12px; position: relative; }
+.ctp-card-cover {
+  position: relative;
+  width: 52px; height: 52px;
+  flex-shrink: 0;
+  border-radius: 8px;
+  overflow: hidden;
+}
+.ctp-card-info { flex: 1; min-width: 0; }
+.ctp-card-title { font-size: 14.5px; font-weight: 700; color: var(--t-1); }
+.ctp-card-sub { margin-top: 3px; font-size: 11.5px; color: var(--t-3); }
+.ctp-card-sub strong { color: var(--t-2); font-weight: 700; }
+.ctp-card-timer {
+  font-variant-numeric: tabular-nums;
+  font-size: 18px;
+  font-weight: 700;
+  color: var(--t-1);
+  flex-shrink: 0;
+  padding-top: 2px;
+}
+.ctp-card-timer[data-urgency="mid"] { color: var(--warn); }
+.ctp-card-timer[data-urgency="high"] { color: var(--danger); }
+.ctp-card.is-done .ctp-card-timer { color: var(--ok); font-size: 14px; text-transform: uppercase; letter-spacing: 0.04em; }
+.ctp-cancel-link {
+  display: inline-flex; align-items: center; gap: 6px;
+  align-self: flex-start;
+  margin-top: -2px;
+  padding: 6px 2px;
+  background: transparent;
+  border: 0;
+  color: var(--t-3);
+  font: inherit; font-size: 11.5px; font-weight: 600;
+  cursor: pointer;
+  transition: color .15s;
+}
+.ctp-cancel-link:hover { color: #fca5a5; }
+.ctp-cancel-confirm {
+  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap;
+  gap: 10px;
+  padding: 10px 12px;
+  background: rgba(239,68,68,0.08);
+  border: 1px solid rgba(239,68,68,0.35);
+  border-radius: 8px;
+  font-size: 12.5px;
+  color: #fca5a5;
+  font-weight: 600;
+}
+.ctp-cancel-confirm-btns { display: inline-flex; gap: 8px; flex-shrink: 0; }
+.ctp-cancel-confirm-btns .ghost-btn { height: 32px; padding: 0 12px; font-size: 12px; }
+
+.ctp-progress {
+  height: 5px;
+  border-radius: 3px;
+  background: rgba(255,255,255,0.06);
+  overflow: hidden;
+}
+.ctp-progress-fill { height: 100%; transition: width 1s linear; }
+
+.ctp-roster { display: flex; flex-direction: column; gap: 8px; }
+.ctp-roster-count { font-size: 11px; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; color: var(--t-3); }
+.ctp-avatars { display: flex; flex-wrap: wrap; gap: 6px; }
+.ctp-avatar {
+  position: relative;
+  display: inline-flex;
+}
+.ctp-avatar-dot {
+  width: 30px; height: 30px;
+  display: grid; place-items: center;
+  border-radius: 999px;
+  color: white;
+  font-size: 10.5px; font-weight: 800;
+  letter-spacing: 0.01em;
+}
+.ctp-avatar.is-pending .ctp-avatar-dot { opacity: 0.55; }
+.ctp-avatar-check {
+  position: absolute; bottom: -2px; right: -2px;
+  width: 14px; height: 14px;
+  display: grid; place-items: center;
+  border-radius: 999px;
+  background: var(--ok);
+  color: #06240f;
+  border: 2px solid var(--bg-2);
+}
+.ctp-avatar-pending {
+  position: absolute; bottom: -6px; left: 50%;
+  transform: translateX(-50%);
+  font-size: 9px; font-weight: 700;
+  color: var(--t-2);
+  background: var(--bg-3);
+  border: 1px solid var(--bd-2);
+  padding: 0 4px;
+  border-radius: 999px;
+  white-space: nowrap;
+  font-variant-numeric: tabular-nums;
+}
+.ctp-avatar-empty {
+  width: 30px; height: 30px;
+  border-radius: 999px;
+  border: 1.5px dashed var(--bd-2);
+}
+
+.ctp-actions {
+  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
+  padding-top: 2px;
+}
+.ctp-actions .act-btn { height: 36px; padding: 0 16px; font-size: 12.5px; }
+.ctp-actions .ghost-btn { height: 36px; padding: 0 14px; font-size: 12.5px; }
+.ctp-note { font-size: 12.5px; color: var(--t-3); }
+.ctp-note-launch { color: var(--ok); font-weight: 600; }
+.ctp-me-status { font-size: 12.5px; font-weight: 600; color: var(--t-2); }
+.ctp-buffer-group { display: inline-flex; gap: 6px; }
+.ctp-buffer-btn {
+  height: 36px; padding: 0 11px;
+  background: rgba(255,255,255,0.04);
+  border: 1px solid var(--bd-2);
+  border-radius: 7px;
+  color: var(--t-1);
+  font: inherit; font-size: 12px; font-weight: 600;
+  cursor: pointer;
+  transition: background .15s, border-color .15s;
+}
+.ctp-buffer-btn:hover { background: rgba(255,255,255,0.08); border-color: var(--bd-3); }
+
+/* ─── Create-nomination form ─── */
+.ctp-create-cta {
+  display: flex; align-items: center; justify-content: center; gap: 8px;
+  height: 48px;
+  background: transparent;
+  border: 1.5px dashed var(--bd-3);
+  border-radius: 12px;
+  color: var(--t-2);
+  font: inherit; font-size: 13px; font-weight: 700;
+  cursor: pointer;
+  transition: border-color .15s, color .15s, background .15s;
+}
+.ctp-create-cta:hover { border-color: var(--accent); color: var(--t-1); background: rgba(255,255,255,0.02); }
+.ctp-create {
+  display: flex; flex-direction: column; gap: 14px;
+  padding: 16px;
+  background: rgba(255,255,255,0.03);
+  border: 1px solid var(--bd-2);
+  border-radius: 12px;
+}
+.ctp-create-row { display: flex; flex-direction: column; gap: 6px; position: relative; }
+.ctp-create-row-inline { flex-direction: row; align-items: center; gap: 10px; flex-wrap: wrap; }
+.ctp-create-label {
+  font-size: 10.5px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
+  color: var(--t-3);
+}
+.ctp-create-search { width: 100%; }
+.ctp-create-matches {
+  position: absolute;
+  top: calc(100% + 4px);
+  left: 0; right: 0;
+  z-index: 20;
+  max-height: 220px;
+  overflow: auto;
+  padding: 4px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-2);
+  border-radius: 10px;
+  box-shadow: 0 16px 40px -8px rgba(0,0,0,0.5);
+}
+.ctp-create-matches button {
+  display: flex; align-items: center; justify-content: space-between; gap: 10px;
+  width: 100%;
+  padding: 9px 10px;
+  background: transparent;
+  border: 0;
+  border-radius: 6px;
+  color: var(--t-1);
+  font: inherit; font-size: 12.5px; font-weight: 600;
+  text-align: left;
+  cursor: pointer;
+}
+.ctp-create-matches button:hover { background: rgba(255,255,255,0.06); }
+.ctp-create-match-meta { color: var(--t-3); font-size: 11px; font-weight: 500; }
+.ctp-create-nomatch { padding: 10px; font-size: 12px; color: var(--t-3); }
+.ctp-create-num {
+  width: 70px; height: 34px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 7px;
+  color: var(--t-1);
+  font: inherit; font-size: 13px; font-weight: 600;
+  text-align: center;
+}
+.ctp-create-hint { font-size: 11.5px; color: var(--t-3); }
+.ctp-duration-opts { display: inline-flex; gap: 6px; flex-wrap: wrap; }
+.ctp-duration-btn {
+  height: 32px; padding: 0 13px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 7px;
+  color: var(--t-2);
+  font: inherit; font-size: 12.5px; font-weight: 700;
+  cursor: pointer;
+  transition: background .15s, color .15s, border-color .15s;
+}
+.ctp-duration-btn:hover { color: var(--t-1); }
+.ctp-duration-btn.is-active { color: white; }
+.ctp-create-foot {
+  display: flex; justify-content: flex-end; gap: 10px;
+  padding-top: 4px;
+}
+.ctp-create-foot .act-btn,
+.ctp-create-foot .ghost-btn { height: 40px; padding: 0 18px; }
+.ctp-time-row { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; margin-top: 4px; }
+/* ─── Time stepper ─── */
+.ctp-timepick {
+  display: flex; align-items: center; gap: 6px;
+  margin-top: 6px;
+}
+.ctp-timepick-field {
+  display: flex; flex-direction: column; align-items: center; gap: 3px;
+}
+.ctp-time-step {
+  width: 54px; height: 24px;
+  display: grid; place-items: center;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 7px;
+  color: var(--t-2);
+  cursor: pointer;
+  transition: background .12s, color .12s, border-color .12s;
+}
+.ctp-time-step:hover { background: var(--bg-4); color: var(--t-1); border-color: var(--bd-3); }
+.ctp-time-step:active { background: color-mix(in srgb, var(--accent) 30%, var(--bg-3)); }
+.ctp-time-cell {
+  width: 54px; height: 44px;
+  display: grid; place-items: center;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-2);
+  border-radius: 9px;
+  font-size: 26px; font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  color: var(--t-1);
+  letter-spacing: 0.02em;
+}
+.ctp-time-editinput {
+  width: 132px; height: 44px;
+  padding: 0;
+  background: var(--bg-3);
+  border: 1px solid color-mix(in srgb, var(--accent) 70%, var(--bd-2));
+  border-radius: 9px;
+  font: inherit; font-size: 26px; font-weight: 700;
+  font-variant-numeric: tabular-nums;
+  color: var(--t-1);
+  text-align: center;
+  letter-spacing: 0.06em;
+}
+.ctp-time-editinput:focus { outline: none; }
+.ctp-time-editinput::placeholder { color: var(--t-4); }
+.ctp-time-colon { font-size: 26px; font-weight: 700; color: var(--t-2); padding-bottom: 2px; }
+.ctp-time-type {
+  align-self: center;
+  margin-left: 8px;
+  height: 30px; padding: 0 12px;
+  background: transparent;
+  border: 1px dashed var(--bd-3);
+  border-radius: 7px;
+  color: var(--t-3);
+  font: inherit; font-size: 11.5px; font-weight: 600;
+  cursor: pointer;
+  transition: color .12s, border-color .12s;
+}
+.ctp-time-type:hover { color: var(--t-1); border-color: var(--accent); }
+.ctp-day-row { gap: 5px; }
+.ctp-day-label {
+  font-size: 10.5px; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase;
+  color: var(--t-3);
+  margin-right: 4px;
+}
+.ctp-day-btn { height: 26px; padding: 0 10px; font-size: 11px; border-radius: 6px; }
+
+/* ─── Quick-bar status variants — LED + label + row tint per status:
+   SCHEDULED (neutral) · CALL TO PLAY (accent, pulsing) ·
+   STARTING SOON (amber, glowing) · READY (green, steady) ─── */
+.ctp-ticker[data-status="scheduled"] {
+  background: var(--bg-2);
+  border-color: var(--bd-2);
+}
+.ctp-ticker[data-status="scheduled"]:hover { background: var(--bg-3); }
+.ctp-ticker[data-status="soon"] {
+  background: color-mix(in srgb, var(--warn) 10%, var(--bg-2));
+  border-color: color-mix(in srgb, var(--warn) 50%, var(--bd-2));
+  animation: ctp-soon-glow 2.4s ease-in-out infinite;
+}
+.ctp-ticker[data-status="soon"]:hover { background: color-mix(in srgb, var(--warn) 16%, var(--bg-2)); }
+@keyframes ctp-soon-glow {
+  0%, 100% { box-shadow: 0 0 0 0 transparent; }
+  50%      { box-shadow: 0 0 0 3px color-mix(in srgb, var(--warn) 28%, transparent); }
+}
+.ctp-ticker[data-status="ready"] {
+  background: color-mix(in srgb, var(--ok) 11%, var(--bg-2));
+  border-color: color-mix(in srgb, var(--ok) 55%, var(--bd-2));
+  box-shadow: 0 0 14px -2px color-mix(in srgb, var(--ok) 35%, transparent);
+}
+.ctp-ticker[data-status="ready"]:hover { background: color-mix(in srgb, var(--ok) 17%, var(--bg-2)); }
+.ctp-ticker-dot[data-status="scheduled"] { background: var(--t-3); animation: none; box-shadow: none; }
+.ctp-ticker-dot[data-status="soon"] { background: var(--warn); animation: ctp-tickerpulse-warn 1.6s ease-out infinite; }
+.ctp-ticker-dot[data-status="ready"] { background: var(--ok); animation: none; box-shadow: 0 0 6px var(--ok); }
+@keyframes ctp-tickerpulse-warn {
+  0%   { box-shadow: 0 0 0 0   color-mix(in srgb, var(--warn) 55%, transparent); }
+  70%  { box-shadow: 0 0 0 6px transparent; }
+  100% { box-shadow: 0 0 0 0 transparent; }
+}
+.ctp-ticker-label[data-status="scheduled"] { color: var(--t-2); }
+.ctp-ticker-label[data-status="soon"] { color: var(--warn); }
+.ctp-ticker-label[data-status="ready"] { color: var(--ok); }
+.ctp-ticker[data-status="soon"] .ctp-ticker-cta { color: var(--warn); }
+.ctp-ticker[data-status="ready"] .ctp-ticker-cta { color: var(--ok); }
+
+/* ─── Quick-bar inline chat preview ─── */
+.ctp-ticker-chat {
+  min-width: 0;
+  display: inline-flex; align-items: center; gap: 5px;
+  color: var(--t-3);
+  font-size: 12px;
+}
+.ctp-ticker-chat svg { flex-shrink: 0; opacity: 0.7; }
+.ctp-ticker-chat b { flex-shrink: 0; font-weight: 700; }
+.ctp-ticker-chat-text {
+  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
+  color: var(--t-2);
+}
+.ctp-card.is-checkin { border-color: color-mix(in srgb, var(--accent) 70%, var(--bd-2)); }
+.ctp-checkin-note {
+  display: flex; align-items: center; gap: 8px;
+  padding: 8px 12px;
+  background: color-mix(in srgb, var(--accent) 13%, transparent);
+  border: 1px solid color-mix(in srgb, var(--accent) 38%, transparent);
+  border-radius: 8px;
+  font-size: 12.5px; font-weight: 600;
+  color: var(--t-1);
+}
+.ctp-checkin-note svg { color: var(--accent); flex-shrink: 0; }
+.ctp-card-timer.is-sched {
+  display: flex; flex-direction: column; align-items: flex-end; gap: 2px;
+}
+.ctp-card-clock { font-size: 18px; line-height: 1; }
+.ctp-card-until { font-size: 10.5px; font-weight: 600; color: var(--t-3); letter-spacing: 0.01em; }
+.ctp-avatar.is-in .ctp-avatar-dot { opacity: 0.8; }
+.ctp-avatar-in {
+  position: absolute; bottom: -6px; left: 50%;
+  transform: translateX(-50%);
+  font-size: 8.5px; font-weight: 800; text-transform: uppercase; letter-spacing: 0.05em;
+  color: var(--t-2);
+  background: var(--bg-3);
+  border: 1px solid var(--bd-2);
+  padding: 0 4px;
+  border-radius: 999px;
+  white-space: nowrap;
+}
+
+/* ─── Ticker mini ready-bubbles ─── */
+.ctp-ticker-bubbles {
+  display: inline-flex; align-items: center;
+  justify-self: end;
+}
+.ctp-mini {
+  position: relative;
+  width: 22px; height: 22px;
+  display: grid; place-items: center;
+  border-radius: 999px;
+  margin-left: -6px;
+  border: 2px solid var(--bg-2);
+  color: white;
+  font-size: 8px; font-weight: 800; letter-spacing: 0.02em;
+}
+.ctp-mini:first-child { margin-left: 0; }
+.ctp-mini[data-state="ready"] { box-shadow: 0 0 0 1.5px var(--ok); }
+.ctp-mini[data-state="pending"] { opacity: 0.75; }
+.ctp-mini[data-state="in"] { opacity: 0.85; }
+.ctp-mini-check {
+  position: absolute; bottom: -3px; right: -4px;
+  width: 11px; height: 11px;
+  display: grid; place-items: center;
+  border-radius: 999px;
+  background: var(--ok);
+  color: #06240f;
+  border: 1.5px solid var(--bg-2);
+}
+.ctp-mini-check svg { width: 7px; height: 7px; }
+.ctp-mini-tag {
+  position: absolute; bottom: -6px; right: -7px;
+  font-style: normal;
+  font-size: 8px; font-weight: 700;
+  line-height: 11px;
+  padding: 0 3px;
+  border-radius: 999px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-2);
+  color: var(--t-2);
+  font-variant-numeric: tabular-nums;
+  white-space: nowrap;
+}
+.ctp-mini-more { background: var(--bg-4); color: var(--t-2); font-size: 8.5px; }
+
+/* ─── Per-call chat ─── */
+.ctp-chat {
+  display: flex; flex-direction: column;
+  border-top: 1px solid var(--bd-1);
+  margin-top: 2px;
+  padding-top: 8px;
+}
+.ctp-chat-toggle {
+  display: flex; align-items: center; gap: 8px;
+  width: 100%;
+  padding: 4px 2px;
+  background: transparent;
+  border: 0;
+  color: var(--t-3);
+  font: inherit; font-size: 11.5px; font-weight: 700;
+  cursor: pointer;
+  transition: color .15s;
+}
+.ctp-chat-toggle:hover { color: var(--t-1); }
+.ctp-chat-toggle svg { flex-shrink: 0; }
+.ctp-chat-count { color: var(--t-4); font-weight: 600; }
+.ctp-chat-unread {
+  min-width: 16px; height: 16px;
+  display: grid; place-items: center;
+  padding: 0 4px;
+  border-radius: 999px;
+  background: var(--accent);
+  color: white;
+  font-size: 9.5px; font-weight: 800;
+  flex-shrink: 0;
+}
+.ctp-chat-preview {
+  flex: 1; min-width: 0;
+  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
+  font-weight: 500;
+  color: var(--t-3);
+  text-align: left;
+}
+.ctp-chat-preview b { font-weight: 700; }
+.ctp-chat-chevron { margin-left: auto; flex-shrink: 0; transition: transform .15s; }
+.ctp-chat.is-open .ctp-chat-chevron { transform: rotate(180deg); }
+.ctp-chat-list {
+  display: flex; flex-direction: column; gap: 6px;
+  max-height: 168px;
+  overflow-y: auto;
+  margin: 8px 0;
+  padding: 10px 12px;
+  background: rgba(0,0,0,0.22);
+  border: 1px solid var(--bd-1);
+  border-radius: 8px;
+}
+.ctp-chat-msg { font-size: 12px; line-height: 1.45; color: var(--t-2); overflow-wrap: anywhere; }
+.ctp-chat-msg b { font-weight: 700; }
+.ctp-chat-text { color: var(--t-1); }
+.ctp-chat-time { margin-left: 6px; font-size: 10px; color: var(--t-4); font-variant-numeric: tabular-nums; }
+.ctp-chat-empty { font-size: 11.5px; color: var(--t-4); text-align: center; padding: 6px 0; }
+.ctp-chat-form { display: flex; gap: 6px; }
+.ctp-chat-input {
+  flex: 1; height: 32px;
+  padding: 0 10px;
+  background: var(--bg-3);
+  border: 1px solid var(--bd-1);
+  border-radius: 7px;
+  color: var(--t-1);
+  font: inherit; font-size: 12px;
+}
+.ctp-chat-input::placeholder { color: var(--t-4); }
+.ctp-chat-input:focus { outline: none; border-color: color-mix(in srgb, var(--accent) 60%, var(--bd-2)); }
+.ctp-chat-send {
+  width: 32px; height: 32px;
+  display: grid; place-items: center;
+  background: color-mix(in srgb, var(--accent) 24%, var(--bg-3));
+  border: 1px solid color-mix(in srgb, var(--accent) 45%, var(--bd-2));
+  border-radius: 7px;
+  color: var(--t-1);
+  cursor: pointer;
+  flex-shrink: 0;
+  transition: background .15s;
+}
+.ctp-chat-send:hover { background: color-mix(in srgb, var(--accent) 40%, var(--bg-3)); }
+
+.ctp-transport-note {
+  margin-top: 10px;
+  font-size: 11.5px;
+  color: var(--t-3);
+}
+.ctp-transport-note.is-error { color: var(--danger); }
+@container launcher (max-width: 1280px) {
+  .ctp-ticker {
+    grid-template-columns: 10px 86px minmax(120px, 1fr) 78px 130px max-content 70px;
+  }
+  .ctp-ticker-by,
+  .ctp-ticker-chat { display: none; }
+}
+@container launcher (max-width: 800px) {
+  .ctp-ticker {
+    grid-template-columns: 10px 78px minmax(100px, 1fr) 76px 64px;
+  }
+  .ctp-ticker-time,
+  .ctp-ticker-bubbles { display: none; }
+}
diff --git a/crates/lanspread-tauri-deno-ts/src/windows/MainWindow.tsx b/crates/lanspread-tauri-deno-ts/src/windows/MainWindow.tsx
index ef53220..911446d 100644
--- a/crates/lanspread-tauri-deno-ts/src/windows/MainWindow.tsx
+++ b/crates/lanspread-tauri-deno-ts/src/windows/MainWindow.tsx
@@ -10,12 +10,15 @@ import { ConfirmRemoveDownloadModal } from '../components/modals/ConfirmRemoveDo
 import { SettingsDialog } from '../components/modals/SettingsDialog';
 import { NoDirectoryState } from '../components/empty/NoDirectoryState';
 import { EmptyResultsState } from '../components/empty/EmptyResultsState';
+import { CallToPlayTicker } from '../components/calltoplay/CallToPlayTicker';
+import { CallToPlayOverlay } from '../components/calltoplay/CallToPlayOverlay';
 
 import { useGameDirectory } from '../hooks/useGameDirectory';
 import { useGames } from '../hooks/useGames';
 import { useGameActions } from '../hooks/useGameActions';
 import { useThumbnails } from '../hooks/useThumbnails';
 import { useSettings } from '../hooks/useSettings';
+import { useCallToPlay } from '../hooks/useCallToPlay';
 
 import { Game } from '../lib/types';
 import { applyFilterAndSort, countByFilter, needsUpdate } from '../lib/gameState';
@@ -72,10 +75,13 @@ export const MainWindow = () => {
     const games = useGames(rescan);
     const actions = useGameActions(games, settings);
     const thumbnails = useThumbnails();
+    const callToPlay = useCallToPlay(settings.username);
 
     const [openGameId, setOpenGameId] = useState<string | null>(null);
     const [removeGameId, setRemoveGameId] = useState<string | null>(null);
     const [settingsOpen, setSettingsOpen] = useState(false);
+    const [callToPlayOpen, setCallToPlayOpen] = useState(false);
+    const [focusedCallId, setFocusedCallId] = useState<string | null>(null);
     const visibleGames = useMemo(
         () => hasGameDirectory ? games.games : [],
         [games.games, hasGameDirectory],
@@ -154,8 +160,22 @@ export const MainWindow = () => {
                 sort={settings.sort}
                 setSort={(v) => setSetting('sort', v)}
                 kebabItems={kebabItems}
+                nominations={callToPlay.nominations}
+                onOpenCallToPlay={() => {
+                    setFocusedCallId(null);
+                    setCallToPlayOpen(true);
+                }}
             />
             <main className="grid-wrap">
+                <CallToPlayTicker
+                    nominations={callToPlay.nominations}
+                    games={games.games}
+                    accent={settings.accent}
+                    onOpen={(callId) => {
+                        setFocusedCallId(callId);
+                        setCallToPlayOpen(true);
+                    }}
+                />
                 {hasGameDirectory ? (
                     <>
                         <ResultsBar shown={filteredGames.length} total={counts.all} />
@@ -220,6 +240,25 @@ export const MainWindow = () => {
                     onClose={() => setSettingsOpen(false)}
                 />
             )}
+
+            {callToPlayOpen && (
+                <CallToPlayOverlay
+                    nominations={callToPlay.nominations}
+                    games={games.games}
+                    username={callToPlay.username}
+                    actions={callToPlay.actions}
+                    focusId={focusedCallId}
+                    transportReady={callToPlay.transportReady}
+                    error={callToPlay.error}
+                    getThumbnail={thumbnails.get}
+                    totalPeerCount={games.totalPeerCount}
+                    onLaunch={handlePrimary}
+                    onClose={() => {
+                        setCallToPlayOpen(false);
+                        setFocusedCallId(null);
+                    }}
+                />
+            )}
         </div>
     );
 };
diff --git a/crates/lanspread-tauri-deno-ts/tests/callToPlay.test.ts b/crates/lanspread-tauri-deno-ts/tests/callToPlay.test.ts
new file mode 100644
index 0000000..6bfbfd5
--- /dev/null
+++ b/crates/lanspread-tauri-deno-ts/tests/callToPlay.test.ts
@@ -0,0 +1,154 @@
+import {
+    CHECKIN_LEAD_MS,
+    phaseOf,
+    bumpTime,
+    normalizeTimeInput,
+    readyCountOf,
+    reduceCallToPlayEvents,
+    statusOf,
+} from '../src/lib/callToPlay.ts';
+import { type CallToPlayAction, type CallToPlayEvent } from '../src/lib/types.ts';
+
+const NOW = 1_000_000;
+
+function assert(condition: unknown, message: string): asserts condition {
+    if (!condition) throw new Error(message);
+}
+
+const assertEquals = <T>(actual: T, expected: T, message: string) => {
+    if (actual !== expected) throw new Error(`${message}: expected ${expected}, got ${actual}`);
+};
+
+const event = (
+    id: string,
+    actor: string,
+    action: CallToPlayAction,
+    at = NOW,
+): CallToPlayEvent => ({ id, call_id: 'call-1', actor, at, action });
+
+const create = (
+    scheduledFor: number | null = null,
+    deadline = NOW + 30 * 60_000,
+): CallToPlayEvent => event('create', 'Alice', {
+    Create: {
+        game_id: 'game-1',
+        max_players: 3,
+        scheduled_for: scheduledFor,
+        deadline,
+    },
+});
+
+Deno.test('play-now call starts with its creator ready', () => {
+    const [nomination] = reduceCallToPlayEvents([create()], NOW);
+    assert(nomination, 'call should exist');
+    assertEquals(nomination.creator, 'Alice', 'creator');
+    assertEquals(nomination.participants.Alice.status, 'ready', 'creator status');
+    assertEquals(phaseOf(nomination, NOW), 'now', 'phase');
+    assertEquals(statusOf(nomination, NOW), 'call', 'status outside starting-soon window');
+});
+
+Deno.test('scheduled RSVP becomes check-in and pending response becomes ready over time', () => {
+    const scheduledFor = NOW + 60 * 60_000;
+    const events = [
+        create(scheduledFor, scheduledFor),
+        event('rsvp', 'Bob', 'Rsvp', NOW + 1),
+        event('respond', 'Bob', { Respond: { ready_at: scheduledFor - 5 * 60_000 } }, NOW + 2),
+    ];
+    const [far] = reduceCallToPlayEvents(events, NOW);
+    assertEquals(phaseOf(far, NOW), 'scheduled', 'far-out phase');
+    assertEquals(far.participants.Bob.status, 'pending', 'buffered response state');
+
+    const checkinNow = scheduledFor - CHECKIN_LEAD_MS;
+    const [checkin] = reduceCallToPlayEvents(events, checkinNow);
+    assertEquals(phaseOf(checkin, checkinNow), 'checkin', 'check-in phase');
+    assertEquals(readyCountOf(checkin, checkinNow), 0, 'nobody ready at check-in opening');
+
+    const [ready] = reduceCallToPlayEvents(events, scheduledFor - 4 * 60_000);
+    assertEquals(readyCountOf(ready, scheduledFor - 4 * 60_000), 1, 'elapsed buffer is ready');
+});
+
+Deno.test('call resolves when the roster fills or its deadline elapses', () => {
+    const full = [
+        create(),
+        event('bob', 'Bob', { Respond: { ready_at: null } }, NOW + 1),
+        event('carol', 'Carol', { Respond: { ready_at: null } }, NOW + 2),
+    ];
+    assertEquals(reduceCallToPlayEvents(full, NOW + 2)[0].state, 'done', 'full roster');
+    assertEquals(
+        reduceCallToPlayEvents([create()], NOW + 31 * 60_000)[0].state,
+        'done',
+        'elapsed deadline',
+    );
+});
+
+Deno.test('creator-only controls cannot be forged by another participant', () => {
+    const forged = [
+        create(),
+        event('cancel', 'Mallory', 'Cancel', NOW + 1),
+        event('start', 'Mallory', 'Start', NOW + 2),
+        event('extend', 'Mallory', { AddTime: { deadline: NOW + 90 * 60_000 } }, NOW + 3),
+    ];
+    const [nomination] = reduceCallToPlayEvents(forged, NOW + 4);
+    assert(nomination, 'forged cancel should not remove call');
+    assertEquals(nomination.state, 'open', 'forged start ignored');
+    assertEquals(nomination.deadline, NOW + 30 * 60_000, 'forged extension ignored');
+});
+
+Deno.test('creator can extend, start, and cancel a call', () => {
+    const extended = reduceCallToPlayEvents([
+        create(),
+        event('extend', 'Alice', { AddTime: { deadline: NOW + 90 * 60_000 } }, NOW + 1),
+    ], NOW + 40 * 60_000)[0];
+    assertEquals(extended.state, 'open', 'extension reopens an elapsed call');
+
+    const started = reduceCallToPlayEvents([
+        create(),
+        event('start', 'Alice', 'Start', NOW + 1),
+    ], NOW + 2)[0];
+    assertEquals(started.state, 'started', 'creator start');
+
+    const cancelled = reduceCallToPlayEvents([
+        create(),
+        event('cancel', 'Alice', 'Cancel', NOW + 1),
+    ], NOW + 2);
+    assertEquals(cancelled.length, 0, 'creator cancel removes call');
+});
+
+Deno.test('reduction is order-independent and deduplicates events and messages', () => {
+    const message = event('message-event', 'Bob', {
+        SendMessage: { message_id: 'message-1', text: 'Ready?' },
+    }, NOW + 2);
+    const duplicateMessage = event('other-event', 'Bob', {
+        SendMessage: { message_id: 'message-1', text: 'duplicate' },
+    }, NOW + 3);
+    const events = [message, create(), message, duplicateMessage];
+    const [nomination] = reduceCallToPlayEvents(events, NOW + 4);
+    assertEquals(nomination.messages.length, 1, 'unique message id');
+    assertEquals(nomination.messages[0].text, 'Ready?', 'first message wins');
+});
+
+Deno.test('actions timestamped before creation cannot mutate a call', () => {
+    const events = [
+        event('early-cancel', 'Alice', 'Cancel', NOW - 1),
+        event('early-response', 'Bob', { Respond: { ready_at: null } }, NOW - 1),
+        create(),
+    ];
+    const [nomination] = reduceCallToPlayEvents(events, NOW + 1);
+    assert(nomination, 'call should survive a pre-creation cancel');
+    assertEquals(Object.keys(nomination.participants).length, 1, 'pre-creation response ignored');
+});
+
+Deno.test('started calls expire from local presentation history', () => {
+    const events = [create(), event('start', 'Alice', 'Start', NOW + 1)];
+    assertEquals(reduceCallToPlayEvents(events, NOW + 2).length, 1, 'fresh started call remains');
+    assertEquals(reduceCallToPlayEvents(events, NOW + 5_000).length, 0, 'old started call expires');
+});
+
+Deno.test('scheduled time input accepts design formats and wraps steppers', () => {
+    assertEquals(normalizeTimeInput('20:00'), '20:00', 'colon format');
+    assertEquals(normalizeTimeInput('2000'), '20:00', 'compact format');
+    assertEquals(normalizeTimeInput('9:30'), '09:30', 'single-digit hour');
+    assertEquals(normalizeTimeInput('24:00'), null, 'invalid hour');
+    assertEquals(bumpTime('23:45', 'minutes', 15), '00:00', 'minute wrap');
+    assertEquals(bumpTime('00:00', 'hours', -1), '23:00', 'hour wrap');
+});
diff --git a/design/launcher/SPEC.md b/design/launcher/SPEC.md
index 9e02f99..c8ce251 100644
--- a/design/launcher/SPEC.md
+++ b/design/launcher/SPEC.md
@@ -548,7 +548,7 @@ The `useNominations({ username, seed })` hook owns the list and exposes
 `createNomination`, `respond`, `rsvp`, `sendMessage`, `leave`, `cancel`,
 `startNow`, `addTime`.
 
-### Mock vs production
+### Design reference vs production
 
 The mock **simulates other people** with a 1-second `setInterval`
 (`tickNomination`): bots RSVP to scheduled calls, ready-up during check-in, walk
@@ -558,14 +558,14 @@ The mock also seeds a few representative calls on mount (a live call with chat,
 a fresh call you started, a scheduled call whose check-in window just opened,
 and one scheduled for later collecting RSVPs).
 
-**In production, replace the simulation with a real-time LAN transport:** the
-launcher instances broadcast nominations, responses, RSVPs, and chat messages to
-each other (whatever the app uses — a small pub/sub over the LAN, a lightweight
-signaling server, or Tauri-side networking). Swap the guts of `useNominations`
-(the `setInterval` + local `setNoms`) for your networking layer that pushes the
-same state shape; the rendering components need nothing else. The `username` that
-identifies "you" comes from `settings.username` (the Profile setting), not a
-prop default.
+The production launcher uses the peer's existing QUIC control channel. Each
+create, response, RSVP, chat, leave, cancel, start, or deadline-extension action
+is an immutable, uniquely identified event. Connected peers receive new events
+immediately, while `Hello` / `HelloAck` exchange the bounded, deduplicated event
+history so a late joiner reconstructs the same calls. The frontend reducer turns
+that event history into the `Nomination` state above and derives time-based phase
+changes locally. The `username` that identifies "you" comes from
+`settings.username` (the Profile setting), not a prop default.
 
 ---
 
@@ -773,5 +773,5 @@ To preview the design in a browser:
 - **Progress state** — designed. See "Download progress" section above. The action-button slot is swapped for a live `DownloadProgress` component (card + modal variants with container-query fallback for narrow tiles). Wire it to your real progress events; the rendering layer is dev-ready.
 - **Keyboard arrow nav** — arrow keys should move focus between cards in the grid; not implemented in the mock but mentioned as a goal.
 - **"Server running" state** — once Start Server actually spawns a process, the button should switch to a *running* state (live indicator dot + "Server running" label + click-to-stop). Not designed this round — flag for follow-up alongside whatever server-status panel the app grows.
-- **Call to Play real-time transport** — the feature is fully designed and interactive, but the mock fakes other players with a local `setInterval` simulation. Production needs a real LAN transport that broadcasts nominations / responses / RSVPs / chat between launcher instances and pushes the same state shape into `useNominations`. Notifications when a call you're in enters its check-in window (OS notification / tray) are also a follow-up.
+- **Call to Play notifications** — real-time LAN transport is implemented. OS / tray notifications when a call you're in enters its check-in window remain a follow-up.
 - **German translations** — the language toggle is wired in Settings, but the catalog of translated UI strings hasn't been compiled. Stand up `react-i18next` (or equivalent) and seed `en.json` from the existing copy; `de.json` is a translation task for whoever owns localization.