fix(terminal): restore terminal text copy behavior (#452)

* fix(terminal): restore terminal text copy behavior

* fix(desktop): route Cmd+C through terminal-aware copy handler on macOS

- Use a custom macOS Copy menu action to dispatch app copy events first, so terminal selections copy without native “no target” beep, while preserving DOM copy fallback for non-terminal contexts.

---------

Co-authored-by: Bohdan Triapitsyn <artmore@protonmail.com>

packages/ui/src/hooks/useMenuActions.ts

@@ -35,6 +35,7 @@ type MenuAction =
   | 'open-diff-tab'
   | 'open-files-tab'
   | 'open-terminal-tab'
+  | 'copy'
   | 'theme-light'
   | 'theme-dark'
   | 'theme-system'
@@ -152,6 +153,15 @@ export const useMenuActions = (
           break;
         }
 
+        case 'copy': {
+          const copyEvent = new Event('openchamber:copy', { cancelable: true });
+          const wasHandled = !window.dispatchEvent(copyEvent);
+          if (!wasHandled) {
+            document.execCommand('copy');
+          }
+          break;
+        }
+
         case 'theme-light':
           setThemeMode('light');
           break;