feat: i18n support for desktop application menu

[2024sy]

Issue for this PR

Closes #35601

Type of change

• Bug fix
• New feature
• Refactor / code improvement
• Documentation

What does this PR do?

Add Chinese (zh-CN) i18n support for the desktop application menu bar (File/Edit/View/Go/Window/Help and all sub-items). Menu labels were previously hardcoded English strings in desktop-menu.ts. This PR integrates them into the existing i18n framework via useLanguage().

Related: #34103 targets the same area but hasn't been merged. This PR takes a different approach - adding dedicated menu.* i18n keys to the dictionary instead of reusing command keys, and also handles the macOS native menu via menu.ts.

How did you verify your code works?

• bun test - i18n parity and desktop-menu tests pass
• bun typecheck - zero errors
• Manual key verification: all 48 menu labels present in both en.ts and zh.ts

Checklist

• I have tested my changes locally
• I have not included unrelated changes in this PR

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicate Found

PR #34103: fix(i18n): translate Windows desktop app menu (File/Edit/View/Go) for all locales
#34103

Why it's related: This PR also addresses translating the desktop application menu (File/Edit/View/Go menu items). PR #35602 appears to be a continuation or expansion of this work, adding complete i18n support for all menu categories with Chinese (zh-CN) translations, while #34103 focused on the initial translation implementation for Windows desktop menu.

You should check if #34103 is already merged or if there's overlap in the menu translation work between these two PRs.

[github-actions]

Thanks for updating your PR! It now meets our contributing guidelines. 👍

[github-actions]

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