fix(web): close slash and mention menus on click outside

[tomsen-ai]

Closes #947

This PR closes the slash menu and @ mention menu when the user clicks outside the composer input area.

What changed

• Added a cinWrapRef to the composer input wrapper.
• Added a document click listener while either menu is open.
• Clicking outside .cin-wrap now closes both menus, matching the behavior of other dropdowns in the composer (e.g., the permission dropdown).
• Removed the listener when both menus are closed or when the component unmounts.

How to verify

1. Open Kimi Web and start a session.
2. Type / in the composer — the slash menu appears.
3. Click outside the menu (e.g., on the chat history) — the menu should close.
4. Repeat with @ — the mention menu should also close on outside click.
5. Confirm that Esc, selecting an item, and submitting a message still close the menus as before.

Notes

• This is a small focused UI fix; no public API changes.
• A changeset has been added for @moonshot-ai/kimi-web.

[changeset-bot]

🦋 Changeset detected

Latest commit: 2f696e6

The changes in this PR will be included in the next version bump.

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[chatgpt-codex-connector]

Cancel pending mention lookups on outside clicks

When a user types @ and clicks the chat area before the 200 ms mention debounce fires, mentionOpen is still false, so this watcher has not installed the document click listener yet. The pending mentionTimer callback can then run after the composer has lost focus and set mentionOpen = true, leaving the mention menu open even though the user already clicked outside; the outside-close path needs to cancel pending mention work or listen while a mention search is pending.

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