feat: add AI summary panel for the active note (control — no noise-reduction config)

[ark-commits]

What

Control arm for the CodeRabbit noise-reduction A/B test. Identical to PR #21's diff (the NoteAiSummary component is byte-for-byte the same, cherry-picked), but the base branch's .coderabbit.yaml has the noise-reduction path_instructions block removed — only poem: false and issue_enrichment.planning: false remain.

The only variable vs. PR #21 is the review config.

Notes

• Base branch: control/no-noise-instruction (config without the noise-reduction instruction)
• Same planted bug catalog: 1 critical, 2 major, 2 minor, 5 nitpicks

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features
  • Added an AI-powered note summary panel in the editor view.
  • Displays a loading state while the summary is being generated.
  • Shows the summary as a short list of bullet points when available.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

📝 Walkthrough

Walkthrough

This PR adds a new note summary component that requests an AI-generated summary from OpenAI and displays the result in the UI. The main app now imports and renders that component with the active note.

Changes

AI note summary UI

Layer / File(s)	Summary
Note summary component src/components/NoteAiSummary.jsx	The new component defines summary state, sends a POST request to OpenAI chat completions from an effect, parses the response into summary text and bullets, and renders loading and bullet output.
App mount src/App.jsx	The app imports NoteAiSummary and renders it with activeNote in the preview/editor area.

Sequence Diagram(s)

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding an AI summary panel for the active note.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/cr-bugs-no-noise

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[ark-commits]

@coderabbitai full review

[coderabbitai]

✅ Action performed

Full review finished.