Add sunset and midnight filter presets

[xusnitdinov]

What does this PR do?

Adds two new one-tap color grades to FILTER_PRESETS in app.js:

• sunset - warm golden-hour glow: lifted temperature/tint, slight brightness + saturation boost, soft vignette.
• midnight - cool, moody night look: cooler temperature, darker, higher contrast, stronger vignette.

Both use only existing, already-rendered grade props, so they combine non-destructively with the sliders just like the other presets. The inspector dropdown builds itself from Object.keys(FILTER_PRESETS), so they appear automatically with no extra wiring.

Closes #26

Type of change

• Bug fix
• New feature (transition / preset / text anim / effect / API)
• Docs
• Refactor / internal

How was it verified?

• node --check server.js && node --check app.js && node --check mcp-server.js passes
• Opened the editor and confirmed both presets appear in the inspector's Filter/Color dropdown and apply to a clip with no console errors
• Confirmed the change in an export (fast or realtime), if it affects rendering
• Updated CLAUDE.md / README.md if the schema, props, or API changed

_{Note: the presets only set existing grade props (temperature, tint, brightness, saturation, contrast, vignette) that already flow through the single shared compositor, so preview and export render identically by construction.}

Checklist

• No new runtime dependencies added
• Preview and export render identically (single compositor)
• Commits are focused and messages are descriptive

[coderabbitai]

📝 Walkthrough

Walkthrough

Two filter presets, sunset and midnight, were added to FILTER_PRESETS. The README and CLAUDE.md preset references were updated from 12 to 14 entries.

Changes

Filter preset expansion

Layer / File(s)	Summary
Add presets and update references app.js, README.md, CLAUDE.md	FILTER_PRESETS now defines sunset and midnight, and both preset lists document the expanded set of 14 presets.

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

Suggested reviewers: plkmarudny

Sequence Diagram(s)

sequenceDiagram
  participant Inspector
  participant FILTER_PRESETS
  participant ClipProperties
  Inspector->>FILTER_PRESETS: Enumerate available presets
  Inspector->>ClipProperties: Apply selected preset
  FILTER_PRESETS->>ClipProperties: Supply sunset or midnight values

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🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The changes add the requested presets in app.js and update the related documentation.
Out of Scope Changes check	✅ Passed	The documentation edits stay aligned with the preset additions and do not add unrelated scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the main change: adding the sunset and midnight filter presets.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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