feat(editor): add 3× and 4× playback speed options

[PALConverteo]

Summary

• Extend PlaybackSpeed type to include 3 and 4
• Add 3× and 4× entries to SPEED_OPTIONS in the settings panel
• Update speed validation in project persistence to accept the new values

No technical limitation — HTML5 playbackRate and AudioContext handle these speeds natively.

Test plan

• Open a project, add a speed region, verify 3× and 4× appear in the dropdown
• Set a region to 4×, play back, confirm video and audio play at correct speed
• Export a video with a 4× speed region, verify output is correct
• Save/reload a project with 3× or 4× regions, confirm they persist

🤖 Generated with Claude Code

Summary by CodeRabbit

New Features

• Added support for 3x and 4x playback speeds in the video editor. Users can now select from an expanded range of playback speeds, with the maximum speed increased from 2x to 4x for customized viewing experiences.

[coderabbitai]

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: b6279801-0487-4326-993a-1da9b4c15ef9

📥 Commits

Reviewing files that changed from the base of the PR and between 6e69da0 and 067ae7f.

📒 Files selected for processing (2)

• src/components/video-editor/projectPersistence.ts
• src/components/video-editor/types.ts

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📝 Walkthrough

Walkthrough

The playback speed feature is expanded to support higher speeds (3× and 4×). Type definitions and speed options are updated, and the project normalization logic is modified to preserve these new speeds during persistence operations.

Changes

Cohort / File(s)	Summary
Playback Speed Expansion src/components/video-editor/types.ts, src/components/video-editor/projectPersistence.ts	Extended PlaybackSpeed type union to include 3 and 4, added corresponding entries to SPEED_OPTIONS, and updated normalization logic to preserve the new speed values.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Poem

🐰 Three times fast, four times too,
The rabbit hopped right through,
New speeds bloom in the editor's view,
Types and logic aligned anew! ✨

🚥 Pre-merge checks | ✅ 1 | ❌ 2

❌ Failed checks (1 warning, 1 inconclusive)

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.
Description check	❓ Inconclusive	The description covers the key changes and includes a test plan, though it does not follow the provided template structure with labeled sections like 'Motivation', 'Type of Change', or 'Related Issue(s)'.	Restructure the description to match the repository template by adding explicit sections: 'Motivation', 'Type of Change' checkbox selection, 'Related Issue(s)', and standard 'Checklist' items.

✅ Passed checks (1 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main feature being added: support for 3× and 4× playback speed options in the editor.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[webadderall]

Could you please attach a screenshot? I'm not sure if the spacing will look pleasing after this addition

[PALConverteo]

Here is a screenshot

[webadderall]

I would like the controls to be on 1 row if possible. You could try any approach you think would look make the playback speed controls look good, but I would suggest getting rid of 0.25x and 1.75x to make space for 3x and 4x