fix(launch): stamp first-use settings on every launch path

First-use launch settings moved out of install/update transactions, but three
edge cases could still leave archive stub values in place while the marker said
the settings pass had already happened.

Start Server now runs the same stamping preflight as Play before launching
server_start.cmd. That covers games whose server scripts read account_name.txt,
language.txt, or SmartSteamEmu.ini before the user ever presses Play.

Install and update now reset the per-game marker before committing
InstallIntent::None. Recovery also clears the marker for install/update states
where the new local tree has already landed, so a crash after promotion cannot
publish a clean intent while preserving a stale marker. Rollback recovery keeps
the marker, because the old local tree remains the active install.

SmartSteamEmu.ini stamping now searches every matching file until one contains a
PersonaName line. This keeps a decoy or incomplete INI from permanently blocking
the real one while still preserving early-exit behavior for account_name.txt and
language.txt, which only need the first matching file.

Test Plan:
- just fmt
- just test
- just clippy
- git diff --check

Refs: local review findings

crates/lanspread-tauri-deno-ts/src-tauri/src/lib.rs

@@ -740,6 +740,12 @@ async fn start_server_windows(
         return Ok(false);
     }
 
+    let Some(state_dir) = state.inner().state_dir.get().cloned() else {
+        log::error!("app state directory is not initialized; cannot start server");
+        return Ok(false);
+    };
+    apply_launch_settings(&state_dir, &game_path, &id, &language, &username).await;
+
     let result = run_as_admin(
         "cmd.exe",
         &server_script_params(&server_start_bin, &id, &settings),