test: cover design text context menu

.project-docs/30-worklog/tasks/20260907-input-context-menu-a7c31e.md

@@ -19,6 +19,9 @@
   with the current window lifecycle.
 - Restore the smallest Main-owned native text-editing context-menu behavior and add
   focused regression coverage at the real window/event seam.
+- Verify that the AI Design `design-chat-composer` textarea shares the same
+  primary Renderer seam, and extend the Electron regression to cover both Code
+  and Design textarea controls without adding a duplicate listener.
 - Update user-facing documentation or Electron E2E coverage only where current
   behavior and the shared fixture require it.
 
@@ -51,9 +54,15 @@
   content still produces no menu.
 - Registered the listener once during primary-window creation without adding
   Renderer, Preload, IPC, Host API, or direct clipboard access.
+- Confirmed `DesignConversationPane` renders the AI Design composer as the
+  ordinary `<textarea id="design-chat-composer">` produced by the shared
+  `Textarea` component inside that same primary Renderer. The window-level
+  listener therefore covers both AI Code and AI Design without a second
+  production listener.
 - Added five focused unit cases and an Electron E2E regression that dispatches
-  a real right-click inside the primary Renderer window and observes one native
-  menu popup with the expected editing actions.
+  real right-clicks on Code and Design textarea controls inside the primary
+  Renderer window and observes two native menu popups with the expected editing
+  actions.
 - Synchronized `README.md` with the restored desktop behavior and ownership
   boundary.
 
@@ -69,7 +78,8 @@
 - Green phase:
   - `corepack pnpm exec vitest run tests/unit/context-menu.test.ts` — 5 passed.
   - `corepack pnpm exec playwright test tests/e2e/context-menu.spec.ts` — 1
-    passed.
+    passed, covering both Code and Design textareas with two observed native
+    popups.
   - `corepack pnpm run typecheck` — passed.
   - `corepack pnpm exec eslint electron/main/context-menu.ts electron/main/index.ts tests/unit/context-menu.test.ts tests/e2e/context-menu.spec.ts`
     — passed.