Add rich file previews

[ryota-murakami]

Summary

• add Shiki-backed source previews and Markdown Reading Mode for skill files
• prevent Reading Mode from horizontally scrolling the whole pane
• strip react-markdown AST props before DOM spread and harden Markdown/code preview tests
• address local CodeRabbit CLI review feedback around skip links, preview language detection, and font fallbacks

Validation

• coderabbit review --agent --base origin/main --type all
• coderabbit review --agent --type uncommitted --base origin/main
• pnpm exec vitest run src/renderer/src/components/skills/filePreviewLanguage.test.ts src/renderer/src/components/skills/FileContent.browser.test.tsx
• pnpm validate
• npx kill-port 9222
• pnpm test:e2e

Note: the final extra CodeRabbit rerun hit the local CLI usage rate limit after all actionable findings from the last completed review were fixed.

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Project	Deployment	Actions	Updated (UTC)
skills-desktop	Ready	Preview, Comment	May 11, 2026 3:13pm

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 35bafda4-6b7e-40ad-aaf8-d0452ad65e72

📥 Commits

Reviewing files that changed from the base of the PR and between 49beef4 and b5cf16b.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml, !pnpm-lock.yaml

📒 Files selected for processing (13)

• package.json
• src/renderer/src/components/SkipToMainContentLink.tsx
• src/renderer/src/components/sidebar/BookmarkDetailModal.tsx
• src/renderer/src/components/sidebar/SourceCard.tsx
• src/renderer/src/components/skills/CodePreview.tsx
• src/renderer/src/components/skills/FileContent.browser.test.tsx
• src/renderer/src/components/skills/FileContent.tsx
• src/renderer/src/components/skills/filePreviewLanguage.test.ts
• src/renderer/src/components/skills/filePreviewLanguage.ts
• src/renderer/src/components/skills/shikiPreview.ts
• src/renderer/src/styles/globals.css
• tailwind.config.ts
• vitest.config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/update-deps-info-file-preview

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 58.99281% with 57 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.43%. Comparing base (49beef4) to head (b5cf16b).

Files with missing lines	Patch %	Lines
src/renderer/src/components/skills/shikiPreview.ts	15.38%	33 Missing ⚠️
src/renderer/src/components/skills/FileContent.tsx	73.75%	18 Missing and 3 partials ⚠️
...derer/src/components/skills/filePreviewLanguage.ts	89.47%	0 Missing and 2 partials ⚠️
src/renderer/src/components/sidebar/SourceCard.tsx	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #153      +/-   ##
==========================================
+ Coverage   52.01%   52.43%   +0.42%     
==========================================
  Files         174      176       +2     
  Lines        4216     4350     +134     
  Branches      893      915      +22     
==========================================
+ Hits         2193     2281      +88     
- Misses       1831     1872      +41     
- Partials      192      197       +5     

Flag	Coverage Δ
unittests	52.43% <58.99%> (+0.42%)	⬆️

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