feat(terminal): add keyboard shortcut to toggle expand/collapse (#1180)

Add Cmd/Ctrl+Shift+E shortcut to toggle terminal expand/collapse state.
The shortcut hint is displayed in the expand button tooltip.

Co-authored-by: Test User <test@example.com>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

apps/frontend/src/renderer/components/Terminal.tsx

@@ -197,12 +197,19 @@ export function Terminal({
         e.stopPropagation();
         onClose();
       }
+
+      // Cmd/Ctrl+Shift+E to toggle expand/collapse
+      if ((e.ctrlKey || e.metaKey) && e.shiftKey && e.key.toLowerCase() === 'e') {
+        e.preventDefault();
+        e.stopPropagation();
+        onToggleExpand?.();
+      }
     };
 
     // Use capture phase to get the event before xterm
     window.addEventListener('keydown', handleKeyDown, true);
     return () => window.removeEventListener('keydown', handleKeyDown, true);
-  }, [isActive, onClose]);
+  }, [isActive, onClose, onToggleExpand]);
 
   // Cleanup on unmount
   useEffect(() => {

apps/frontend/src/renderer/components/terminal/TerminalHeader.tsx

@@ -188,7 +188,7 @@ export function TerminalHeader({
               e.stopPropagation();
               onToggleExpand();
             }}
-            title={isExpanded ? t('terminal:expand.collapse') : t('terminal:expand.expand')}
+            title={`${isExpanded ? t('terminal:expand.collapse') : t('terminal:expand.expand')} (${navigator.platform.includes('Mac') ? '⌘' : 'Ctrl'}+Shift+E)`}
           >
             {isExpanded ? (
               <Minimize2 className="h-3.5 w-3.5" />