fix(tui): handle macOS option-v details shortcut

## Summary
- treat the macOS Option+V legacy glyph as the tool-details shortcut instead of inserting text
- show the platform-appropriate details shortcut label in active tool status/footer copy
- add regression coverage for macOS glyph handling and existing tool-details target behavior

## Test plan
- cargo test -p deepseek-tui macos_option_v_glyph_is_treated_as_details_shortcut_only_on_macos --locked
- cargo test -p deepseek-tui detail_target_prefers_visible_tool_card --locked
- cargo test -p deepseek-tui active_tool_status_label_summarizes_live_tool_group --locked
- cargo fmt --all -- --check
- git diff --check
- GitHub CI: Version drift, Lint, Test (ubuntu-latest), Test (macos-latest), Test (windows-latest), npm wrapper smoke, GitGuardian

crates/tui/src/tui/ui.rs

@@ -2087,6 +2087,11 @@ async fn run_event_loop(
             let is_plain_char = matches!(key.code, KeyCode::Char(_)) && !has_ctrl_alt_or_super;
             let is_enter = matches!(key.code, KeyCode::Enter);
 
+            if is_macos_option_v_legacy_key(&key) {
+                open_tool_details_pager(app);
+                continue;
+            }
+
             if !is_plain_char
                 && !is_enter
                 && let Some(pending) = app.flush_paste_burst_before_modified_input_if_enabled()
@@ -6661,7 +6666,7 @@ fn active_tool_status_label(app: &App) -> Option<String> {
     if active_foreground_shell_running(app) {
         parts.push("Ctrl+B shell".to_string());
     }
-    parts.push("Alt+V".to_string());
+    parts.push(tool_details_shortcut_label().to_string());
     Some(parts.join(" \u{00B7} "))
 }
 
@@ -8155,7 +8160,8 @@ fn selected_detail_footer_label(app: &App) -> Option<String> {
     )?;
     let label = detail_target_label(app, cell_index)?;
     Some(format!(
-        "Alt+V details: {}",
+        "{} details: {}",
+        tool_details_shortcut_label(),
         truncate_line_to_width(&label, 34)
     ))
 }
@@ -8228,6 +8234,14 @@ fn is_file_tree_toggle_shortcut(key: &KeyEvent) -> bool {
     ctrl_shift_e || cmd_shift_e
 }
 
+fn tool_details_shortcut_label() -> &'static str {
+    if cfg!(target_os = "macos") {
+        "\u{2325}+V"
+    } else {
+        "Alt+V"
+    }
+}
+
 fn details_shortcut_modifiers(modifiers: KeyModifiers) -> bool {
     modifiers.is_empty()
         || modifiers == KeyModifiers::SHIFT
@@ -8236,6 +8250,14 @@ fn details_shortcut_modifiers(modifiers: KeyModifiers) -> bool {
             && !modifiers.contains(KeyModifiers::SUPER))
 }
 
+fn is_macos_option_v_legacy_key(key: &KeyEvent) -> bool {
+    is_macos_option_v_legacy_key_for_platform(key, cfg!(target_os = "macos"))
+}
+
+fn is_macos_option_v_legacy_key_for_platform(key: &KeyEvent, is_macos: bool) -> bool {
+    is_macos && key.modifiers.is_empty() && matches!(key.code, KeyCode::Char('\u{221A}'))
+}
+
 fn is_paste_shortcut(key: &KeyEvent) -> bool {
     let is_v = matches!(key.code, KeyCode::Char('v') | KeyCode::Char('V'));
     let is_legacy_ctrl_v = matches!(key.code, KeyCode::Char('\u{16}'));

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

@@ -881,7 +881,7 @@ fn active_tool_status_label_summarizes_live_tool_group() {
     assert!(label.contains("run cargo test"));
     assert!(label.contains("1 active"));
     assert!(label.contains("1 done"));
-    assert!(label.contains("Alt+V"));
+    assert!(label.contains(tool_details_shortcut_label()));
 }
 
 #[test]
@@ -2261,12 +2261,26 @@ fn detail_target_prefers_visible_tool_card() {
     app.viewport.last_transcript_visible = 6;
 
     assert_eq!(detail_target_cell_index(&app), Some(1));
+    let expected = format!("{} details: file_search", tool_details_shortcut_label());
     assert_eq!(
         selected_detail_footer_label(&app).as_deref(),
-        Some("Alt+V details: file_search")
+        Some(expected.as_str())
     );
 }
 
+#[test]
+fn macos_option_v_glyph_is_treated_as_details_shortcut_only_on_macos() {
+    let option_v = KeyEvent::new(KeyCode::Char('\u{221A}'), KeyModifiers::NONE);
+    assert!(is_macos_option_v_legacy_key_for_platform(&option_v, true));
+    assert!(!is_macos_option_v_legacy_key_for_platform(&option_v, false));
+
+    let modified = KeyEvent::new(KeyCode::Char('\u{221A}'), KeyModifiers::SHIFT);
+    assert!(!is_macos_option_v_legacy_key_for_platform(&modified, true));
+
+    let plain_v = KeyEvent::new(KeyCode::Char('v'), KeyModifiers::NONE);
+    assert!(!is_macos_option_v_legacy_key_for_platform(&plain_v, true));
+}
+
 #[test]
 fn open_tool_details_pager_supports_active_virtual_tool_cell() {
     let mut app = create_test_app();