feat: add video reverse playback option (closes #122)

[garima-agarwall]

Description

Added a reverse video toggle in the Rotation section. Uses FFmpeg's reverse video filter and areverse audio filter to play both video and audio backwards. An inline warning is shown when the file is larger than 100MB.

Related Issue

Closes #122

Type of Contribution

• [yes ] New feature
• [yes ] GSSoC contribution

Participant Info

• GitHub username: garima-agarwall
• Contribution level (Beginner/Intermediate/Advanced): Beginner

Screen Recording

Recording / Loom link:
https://github.com/user-attachments/assets/e85a91c1-663e-47c0-8d48-8fa1d968f213

Checklist

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

[vercel]

@garima-agarwall is attempting to deploy a commit to the magic-peach1's projects Team on Vercel.

A member of the Team first needs to authorize it.

[github-actions]

✅ PR Format Check Passed — @garima-agarwall

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.

[github-actions]

👋 Thanks for your PR, @garima-agarwall!

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

🟠 GSSoC'26 PR detected — thanks for contributing under GirlScript Summer of Code 2026!

What happens next

1. 🤖 Automated checks — build & TypeScript typecheck will run automatically
2. ✅ Vercel preview — a preview deployment will be created (requires maintainer authorization for fork PRs)
3. 👀 Code review — a maintainer will review your changes
4. 🚀 Merge — once approved, your PR will be merged!

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! 🎉

[garima-agarwall]

@magic-peach I have made the necessary changes and put up this new PR. Kindly give feedback on this.