style: apply nightly rustfmt import grouping across the workspace

rustfmt.toml sets group_imports, imports_granularity and imports_layout,
which are nightly-only; agents formatted with stable rustfmt, which
ignored them. This is a formatting-only pass with `cargo +nightly fmt`.

Test Plan:
- cargo clippy --workspace --all-targets -- -D warnings
- cargo test --workspace

crates/ghostty-input/src/binding/tests.rs

@@ -1,9 +1,13 @@
 #![allow(clippy::unwrap_used)]
 
-use super::set::{AppendChainError, EntryFormatter, Value};
-use super::*;
-use crate::key::{Key, KeyEvent};
-use crate::key_mods::Mods;
+use super::{
+    set::{AppendChainError, EntryFormatter, Value},
+    *,
+};
+use crate::{
+    key::{Key, KeyEvent},
+    key_mods::Mods,
+};
 
 fn uni(c: char) -> Trigger {
     Trigger {