Add Auto-Save for User Editing Sessions

[deepikamishra25]

Description

Currently, users may lose their work if they accidentally refresh the page or close the browser while editing screenshots.

Proposed Solution

Automatically save editor state in localStorage.
Restore the previous session on page reload.
Provide a "Clear Saved Session" option.

Benefits

Prevents accidental data loss.
Improves user experience.
Useful for users working on multiple screenshots.

i am gssoc2026 contributor
@magic-peach please assign this issue to me

[github-actions]

👋 Thanks for opening an issue, @deepikamishra25!

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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

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