host: Add waiter to fix flaky spec test

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Host Test Results

1 files  ±    0  1 suites  ±0   0s ⏱️ - 1h 28m 28s
2 tests  - 1 648  0 ✅  - 1 635  0 💤  - 13  2 ❌ +1 
2 runs   - 1 662  0 ✅  - 1 648  0 💤  - 13  2 ❌ ±0 

For more details on these failures, see this check.

Results for commit 574b7cb. ± Comparison against base commit 138568c.

This pull request removes 1650 and adds 2 tests. Note that renamed tests count towards both.

Chrome ‑ Acceptance | AI Assistant tests: "Add Same Skills" copies skill configuration to new session
Chrome ‑ Acceptance | AI Assistant tests: active LLM event includes metadata when switching models
Chrome ‑ Acceptance | AI Assistant tests: ai assistant panel width persists to localStorage
Chrome ‑ Acceptance | AI Assistant tests: attached cards include computed fields
Chrome ‑ Acceptance | AI Assistant tests: attaches a card in a conversation multiple times
Chrome ‑ Acceptance | AI Assistant tests: auto-attached cards behaviour
Chrome ‑ Acceptance | AI Assistant tests: auto-attached file is not displayed in interact mode
Chrome ‑ Acceptance | AI Assistant tests: auto-attached spec card can be removed
Chrome ‑ Acceptance | AI Assistant tests: auto-attaches spec card when spec panel is open and spec is selected
Chrome ‑ Acceptance | AI Assistant tests: can display and remove auto attached file
…

Chrome ‑ Global error: Uncaught TypeError: Failed to fetch at http://localhost:7357/assets/chunk.c40af6a3c8fd2cc8b895.js, line 141153  After execution of test: Acceptance | Spec preview: view when there is a single spec instance 
Chrome ‑ Global error: Uncaught TypeError: Failed to fetch at http://localhost:7357/assets/chunk.c40af6a3c8fd2cc8b895.js, line 141153  While executing test: Acceptance | Spec preview: view when there is a single spec instance 

♻️ This comment has been updated with latest results.