[FEATURE] Add Save/Load Project State using LocalStorage

[saurabh19304]

Closes #686

What this PR does

• Adds saveProject(), listProjects(), loadProject(), deleteProject() to useVideoEditor.ts
• Adds modal-based Save and Load UI in VideoEditor.tsx
• Persists editor settings in localStorage under reframe-projects-v1
• Video blobs are intentionally not persisted (browser limitation)

Files changed

• src/hooks/useVideoEditor.ts
• src/components/VideoEditor.tsx

Testing

1. Open Reframe
2. Select output size and adjust settings
3. Click Save Project → enter a name
4. Refresh the page
5. Click Load Project → select saved project → settings restored ✅

[github-actions]

👋 Thanks for opening an issue, @saurabh19304!

Our maintainers will review this shortly 🚀

Before you start working

• 📖 Read the CONTRIBUTING.md guide
• 💬 Wait for a maintainer to assign you the issue before starting work
• 🔍 Search for existing issues to avoid duplicates

For GSSoC'26 contributors

If you're contributing under GirlScript Summer of Code 2026, please mention it in your comment when requesting assignment:

"I'd like to work on this — contributing under GSSoC'26"

Architecture notes

Reframe is a static Next.js app with output: "export". Key points:

• All video processing uses FFmpeg.wasm (client-side, no server)
• headers() in next.config.ts won't work — use vercel.json instead
• not-found.tsx requires public/404.html + vercel.json routes config

Happy contributing! ⭐ Star the repo if you find it useful!

[Flux07-gezz]

/assign gssoc 26

[github-actions]

Hey @Flux07-gezz, this issue has been assigned to you! 🎉 Please make progress within 5 days or it will be automatically unassigned due to inactivity.

[jagzgotspark]

Hi @magic-peach , I'd like to work on this issue contributing under GSSoC'26.
please assign me this issue.

[github-actions]

Hey @jagzgotspark, this issue is already assigned to @Flux07-gezz. Please pick another issue or wait for it to become available. You can browse open unassigned issues here: https://github.com/magic-peach/reframe/issues?q=is%3Aissue+is%3Aopen+no%3Aassignee

[sarvani-03]

/assign

[github-actions]

Hey @sarvani-03, this issue is already assigned to @Flux07-gezz. Please pick another issue or wait for it to become available. You can browse open unassigned issues here: https://github.com/magic-peach/reframe/issues?q=is%3Aissue+is%3Aopen+no%3Aassignee