feat(app): add file tree image asset toggle

[murongg]

Summary

• Add a file tree toolbar toggle for hiding and showing image assets without changing native file scanning.
• Persist the image asset visibility preference in workspace state.
• Add localized labels for all supported languages and coverage for the visibility behavior.

Why

• Keeps generated image asset files out of the file tree when users want a cleaner Markdown workspace structure.

Validation

• pnpm --filter @markra/app test -- MarkdownFileTreeDrawer.test.tsx useMarkdownFileTree.test.tsx passed (90 files, 1357 tests)
• pnpm --filter @markra/app typecheck:test passed
• pnpm --filter @markra/app build passed
• pnpm --filter @markra/shared build passed
• git diff --check passed

Risk

• Low: the filtering is UI-only, and native file listing plus image asset handling remain unchanged.

Related Issues

• Closes [Feature]: 关于assets文件夹的隐藏 #276

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Project	Deployment	Actions	Updated (UTC)
markra-web	Ready	Preview, Comment	Jun 22, 2026 9:30am