fix(02-07): loading overlay can never wedge the Chat/AIUI UI permanently

Belt-and-suspenders fix on top of AIUI's own root-cause fix (the
archyBridge origin bug, fixed in the AIUI repo): the archy-side loading
overlay now gets pointer-events:none (it has no interactive content of
its own, so it should never have blocked clicks reaching the iframe
underneath) and a bounded 8s timeout that unconditionally hides it if
no 'ready' message ever arrives — regardless of AIUI/backend state.
The timeout only dismisses the overlay; it does not fabricate a
successful connection, so the connected indicator still reflects
reality.

Two new tests in chatAiuiEmbed.test.ts cover the timeout firing at
exactly 8s and not firing prematurely.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

neode-ui/src/views/__tests__/chatAiuiEmbed.test.ts

@@ -142,4 +142,42 @@ describe('Chat / AIUI embed URL stability + D-14 defaults (02-07)', () => {
     expect(wrapper.find('.chat-loading').exists()).toBe(false)
     wrapper.unmount()
   })
+
+  // Belt-and-suspenders backstop added after live testing found the overlay
+  // could wedge the UI when the 'ready' handshake never arrives (a real bug,
+  // separately fixed at its root cause in AIUI's archyBridge.ts) — this
+  // proves the archy side never depends on that fix alone.
+  it('dismisses the loading overlay after a bounded timeout even if no ready message ever arrives', async () => {
+    vi.useFakeTimers()
+    try {
+      const { wrapper } = mountChatInKeepAlive()
+      expect(wrapper.find('.chat-loading').exists()).toBe(true)
+
+      await vi.advanceTimersByTimeAsync(7999)
+      expect(wrapper.find('.chat-loading').exists()).toBe(true)
+
+      await vi.advanceTimersByTimeAsync(1)
+      expect(wrapper.find('.chat-loading').exists()).toBe(false)
+      // The connection indicator must NOT falsely report connected — the
+      // timeout only dismisses the blocking overlay, it does not fabricate
+      // a successful handshake.
+      expect(wrapper.find('[title="chat.aiuiConnected"]').exists()).toBe(false)
+
+      wrapper.unmount()
+    } finally {
+      vi.useRealTimers()
+    }
+  })
+
+  it('does not dismiss the loading overlay before the timeout elapses', async () => {
+    vi.useFakeTimers()
+    try {
+      const { wrapper } = mountChatInKeepAlive()
+      await vi.advanceTimersByTimeAsync(4000)
+      expect(wrapper.find('.chat-loading').exists()).toBe(true)
+      wrapper.unmount()
+    } finally {
+      vi.useRealTimers()
+    }
+  })
 })