feat: export preview frame as png

[Palakchoithani]

Description

Adds an Export frame action in the preview toolbar to download the current frame as a PNG.

Related Issue

Closes #720

Type of Contribution

• New feature
• GSSoC contribution

Participant Info

• GitHub username: @Palakchoithani
• Contribution level: Intermediate

Screen Recording

• Recording / Loom link:

Screen.Recording.2026-05-19.at.5.27.57.PM.mov

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[github-actions]

👋 Thanks for your PR, @Palakchoithani!

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! 🎉

[github-actions]

✅ PR Format Check Passed — @Palakchoithani

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

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Project	Deployment	Actions	Updated (UTC)
reframe	Ready	Preview, Comment	May 19, 2026 0:38am

[magic-peach]

@Palakchoithani please star the repo