feat(trim): Add Video Trimming Support with Start and End Selection (#993)

[Rucha0901]

Description

This pull request adds high-fidelity, interactive Video Trimming Support with Start and End Selection (#993). Users can now visually select custom start and end points via a timeline-based dual-handle slider overlaying their audio waveform, preview their trimmed cuts frame-by-frame in real-time, and automatically loop playback within their selected region before exporting.

Key Enhancements:

1. Interactive Dual-Handle Slider: Upgraded the trim sidebar section in TrimControl.tsx with a visual track containing drag handles, dark background masks for trimmed-out regions, and a neon highlight for the selected clip.
2. Audio Waveform Integration: Rendered the WaveformCanvas as a gorgeous background for the timeline slider.
3. Synchronized Playback Preview: Destructured currentTime and seekTo from useVideoEditor and passed them into TrimControl. Dragging the handles instantly seeks the player to the selected frame, and a vertical red playhead tracks active playback.
4. Playback Loop Boundary Enforcement: Updated VideoPreview.tsx to automatically loop playback inside the selection bounds (trimStart to trimEnd) during active play, while allowing standard frame inspection when paused.
5. Keyboard Accessibility: Added slider roles and keydown handlers (ArrowLeft / ArrowRight) to nudge selection handles by 0.1 seconds.
6. Linting and Typing: Resolved all TypeScript definitions and accessibility aria slider attributes, passing lint checks cleanly.

Related Issue

Closes #993

Type of Contribution

• New feature
• Bug fix
• Documentation update
• Refactor

Participant Info

• GitHub username: Rucha0901
• Contribution level (Beginner/Intermediate/Advanced): Advanced

Screen Recording

Demonstrated full visual range selection, drag-to-seek, keyboard adjustments, and playback boundary loop enforcement.
Recording / Loom link: [Attached in system capture]

Checklist

• I have read the contribution guidelines
• My changes follow the project structure
• I have tested my changes in Chrome, Firefox, and Safari
• bun run lint passes (no ESLint errors)
• bunx tsc --noEmit passes (no TypeScript errors)
• New interactive elements have aria-label / accessible names
• No console.log statements left in
• This PR is related to a valid issue
• Screen recording attached above (required for UI/feature/design changes)

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[github-actions]

👋 Thanks for your PR, @Rucha0901!

Welcome to Reframe — a browser-based video editor built for everyone 🎬

What happens next

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Quick checklist

• PR title follows Conventional Commits (e.g. feat: add dark mode)
• Linked the issue this PR closes (e.g. Closes #123)
• Tested the changes locally (bun run dev)
• Build passes (bun run build)

Useful links

• 📖 CONTRIBUTING.md
• 🐛 Open Issues
• ⭐ Star the repo to support the project!

Happy coding! 🎉

[github-actions]

✅ PR Format Check Passed — @Rucha0901

Basic format checks passed. A maintainer will review your code changes.

This does not mean the PR is approved — it just means the format is correct.

[Rucha0901]

@magic-peach ,check the PR .