fix(layout): show no-webcam for camera-less projects

[arhxam]

Summary

• derive the layout pane's displayed preset from actual camera availability
• show the disabled No Webcam state for camera-less timelines, matching preview/export behavior
• hide PiP-only shape, size, and reactive-zoom controls when no camera exists
• preserve the stored camera layout preference so it returns unchanged when a camera-backed clip is present

This completes the remaining UI portion of #248 after the renderer/export correction merged in #261.

Related issue

Fixes#248

Type of change

• Bug fix
• Feature
• Enhancement
• Documentation
• Refactor / maintenance
• Performance
• Security

Release impact

• Patch
• Minor
• Major / breaking change
• No release note needed

Desktop impact

• Windows
• macOS
• Linux
• Installer / packaging
• Not platform-specific

Screenshots / video

Not included; DOM regression coverage verifies both camera-less and camera-present states.

Testing

• Started with a failing camera-less selector regression test (picture-in-picture was displayed)
• npx vitest --run src/components/ai-edition/RightPanes.layout.test.tsx src/components/ai-edition/RightPanes.i18n.test.tsx (7 passed)
• npm run test (1,679 passed, 1 skipped across 141 files)
• npx tsc --noEmit
• npx tsc -p tsconfig.test.json --noEmit
• npx biome check src/components/ai-edition/RightPanes.tsx src/components/ai-edition/RightPanes.layout.test.tsx
• npm run docs:check
• npm run i18n:check
• npm run build-vite

Authored with Codex assistance and manually verified against the remaining #248 UI behavior.

Summary by CodeRabbit

• Bug Fixes
  • Improved layout behavior when no webcam footage is available.
  • Webcam-dependent controls are now disabled and the interface displays a “no webcam” layout.
  • Saved webcam preferences are preserved and automatically restored when camera footage is available.
  • Camera-specific controls and reactive zoom now correctly reflect the available footage.

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6b0812d0-c6e5-4a38-8716-cbcb61c3e4d9

📥 Commits

Reviewing files that changed from the base of the PR and between ff2f1c6 and 7fad1f1.

📒 Files selected for processing (1)

• src/components/ai-edition/RightPanes.layout.test.tsx

📝 Walkthrough

Walkthrough

LayoutPane now uses a no-webcam effective layout when no camera clips exist. Tests cover camera-present and camera-absent projects while confirming that the saved preset remains unchanged.

Changes

Camera-aware layout handling

Layer / File(s)	Summary
Effective layout and test coverage src/components/ai-edition/RightPanes.tsx, src/components/ai-edition/RightPanes.layout.test.tsx	LayoutPane derives no-webcam when no camera track exists, updates related control visibility, preserves the saved preset, and adds tests for both camera states.

Estimated code review effort: 2 (Simple) | ~10 minutes

Suggested reviewers:etiennelescot

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the primary change: showing the No Webcam layout for projects without camera tracks.
Description check	✅ Passed	The description includes the required summary, issue reference, change type, release impact, platform impact, screenshots note, and detailed testing.
Linked Issues check	✅ Passed	The changes satisfy issue #248 by showing No Webcam for camera-less timelines and preventing the incorrect Picture in Picture state.
Out of Scope Changes check	✅ Passed	The implementation and regression tests directly support issue #248 and the stated layout-pane objectives.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@src/components/ai-edition/RightPanes.layout.test.tsx`:
- Around line 67-88: The “LayoutPane camera availability” tests need to cover
all camera-dependent UI behavior when no camera is available. Extend the
no-camera case to assert reactive zoom and webcam size are hidden, and verify
the remaining camera-dependent controls are disabled; keep the existing
saved-preset assertions unchanged and add coverage in this test file for each
new branch.

🪄 Autofix

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: f87047f2-ff91-4d9d-9804-be27ca140d0b

📥 Commits

Reviewing files that changed from the base of the PR and between 4e7a85b and ff2f1c6.

📒 Files selected for processing (2)

• src/components/ai-edition/RightPanes.layout.test.tsx
• src/components/ai-edition/RightPanes.tsx