docs: add F11 fullscreen exit instructions to FAQ

[cfbber]

Summary

• 中英文 FAQ 各新增 1004 条目，说明 F11 全屏切换及退出方法
• 用户在 Windows/Linux 下误按 F11 进入全屏后，不再困惑于如何退出

🤖 Generated with Claude Code

Summary by CodeRabbit

• Documentation
  • Added new FAQ entry explaining how to exit fullscreen mode on Windows/Linux when pressing F11, including two methods: press F11 again or use the hidden exit button at the top-center of the window. Updated in both English and Chinese documentation.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: e6363be7-ce43-44c5-9ba7-837e06a157c9

📥 Commits

Reviewing files that changed from the base of the PR and between 19de00f and 901ce96.

📒 Files selected for processing (2)

• doc/FAQ-CN.md
• doc/FAQ.md

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Walkthrough

This PR adds a new FAQ entry (1004) to both English and Chinese FAQ documentation explaining how to exit fullscreen mode on Windows/Linux after accidentally pressing F11. The entry describes two recovery methods: pressing F11 again or accessing a hidden exit button by moving the mouse to the top-center of the window.

Changes

Fullscreen Exit FAQ Documentation

Layer / File(s)	Summary
FAQ entry 1004: Fullscreen exit instructions doc/FAQ-CN.md, doc/FAQ.md	Added matching section 1004 in both English and Chinese FAQ files documenting how to exit fullscreen mode on Windows/Linux, including keyboard toggle (F11) and hidden mouse-accessible exit button (top-center) methods.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Poem

In fullscreen's grip, a user once trapped,
Now F11 twice brings the answer unwrapped! 🐰
Or mouse to the top—a button so shy,
Reveals itself gently when you drift by. 🖱️✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately describes the main change: adding F11 fullscreen exit instructions to FAQ documentation.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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