fix(tui): normalize macOS SUPER (Cmd) to CONTROL for keyboard shortcuts (#2938)

On macOS, terminal emulators may report Cmd (SUPER) instead of Ctrl
(CONTROL) for keyboard shortcuts, depending on the terminal app and
its configuration. This caused Ctrl+B, Ctrl+Alt+2, and other shortcuts
to be inconsistent.

Fix:
- Add normalize_macos_modifiers() in composer_ui.rs
- On macOS: map SUPER to CONTROL when CONTROL is not already set
- On other platforms: no-op
- Apply normalization at the key event entry point in ui.rs

Tests:
- normalize_macos_modifiers_maps_super_to_control
- normalize_macos_modifiers_preserves_existing_control
- normalize_macos_modifiers_leaves_alt_unchanged

crates/tui/src/tui/composer_ui.rs

@@ -121,6 +121,23 @@ pub(crate) fn is_word_cursor_modifier(modifiers: KeyModifiers) -> bool {
     modifiers.contains(KeyModifiers::CONTROL) || modifiers.contains(KeyModifiers::ALT)
 }
 
+/// On macOS, map `SUPER` (Cmd ⌘) to `CONTROL` when `CONTROL` is not already
+/// set, so that terminal emulators that don't pass Ctrl faithfully still work.
+/// On all other platforms this is a no-op.
+#[cfg(target_os = "macos")]
+pub(crate) fn normalize_macos_modifiers(modifiers: KeyModifiers) -> KeyModifiers {
+    if modifiers.contains(KeyModifiers::SUPER) && !modifiers.contains(KeyModifiers::CONTROL) {
+        modifiers | KeyModifiers::CONTROL
+    } else {
+        modifiers
+    }
+}
+
+#[cfg(not(target_os = "macos"))]
+pub(crate) fn normalize_macos_modifiers(modifiers: KeyModifiers) -> KeyModifiers {
+    modifiers
+}
+
 pub(crate) fn handle_composer_alt_word_motion_key(app: &mut App, key: KeyEvent) -> bool {
     if !key.modifiers.contains(KeyModifiers::ALT) || key.modifiers.contains(KeyModifiers::CONTROL) {
         return false;

crates/tui/src/tui/ui.rs

@@ -2972,7 +2972,7 @@ async fn run_event_loop(
             // User interaction — clear the ✅ completion marker from the title.
             crate::tui::notifications::reset_title_on_interaction();
 
-            let Event::Key(key) = evt else {
+            let Event::Key(mut key) = evt else {
                 continue;
             };
 
@@ -2980,6 +2980,13 @@ async fn run_event_loop(
                 continue;
             }
 
+            // Normalize macOS modifiers: map SUPER (Cmd) to CONTROL so that
+            // keyboard shortcuts work consistently across terminal emulators
+            // (Terminal.app, iTerm2, Kitty, etc.) that may report different
+            // modifier flags (#2938).
+            let mapped = crate::tui::composer_ui::normalize_macos_modifiers(key.modifiers);
+            key.modifiers = mapped;
+
             // Decision card keyboard routing (v0.8.43 truth-surface).
             // When a card is active, number keys 1-9 select options,
             // j/k or Up/Down navigate, and Enter confirms.

crates/tui/src/tui/ui/tests.rs

@@ -298,6 +298,33 @@ fn word_cursor_modifier_accepts_control_and_alt() {
     assert!(!is_word_cursor_modifier(KeyModifiers::SHIFT));
 }
 
+#[test]
+fn normalize_macos_modifiers_maps_super_to_control() {
+    use crate::tui::composer_ui::normalize_macos_modifiers;
+    // SUPER (Cmd) without CONTROL should gain CONTROL.
+    let normalized = normalize_macos_modifiers(KeyModifiers::SUPER);
+    assert!(normalized.contains(KeyModifiers::CONTROL));
+    assert!(normalized.contains(KeyModifiers::SUPER));
+}
+
+#[test]
+fn normalize_macos_modifiers_preserves_existing_control() {
+    use crate::tui::composer_ui::normalize_macos_modifiers;
+    // CONTROL already set — shouldn't be removed.
+    let normalized = normalize_macos_modifiers(KeyModifiers::CONTROL | KeyModifiers::SUPER);
+    assert!(normalized.contains(KeyModifiers::CONTROL));
+    assert!(normalized.contains(KeyModifiers::SUPER));
+}
+
+#[test]
+fn normalize_macos_modifiers_leaves_alt_unchanged() {
+    use crate::tui::composer_ui::normalize_macos_modifiers;
+    let normalized = normalize_macos_modifiers(KeyModifiers::ALT);
+    // On non-macOS this is a no-op; on macOS ALT stays unchanged.
+    assert!(normalized.contains(KeyModifiers::ALT));
+    assert!(!normalized.contains(KeyModifiers::SUPER));
+}
+
 #[test]
 fn alt_f_and_alt_b_move_by_word_without_inserting_text() {
     let mut app = create_test_app();