feat: add export history panel with re-download support

[imuniqueshiv]

Description

Implemented an export history panel that allows users to re-download previous exports during the current browser session.

Changes made

• Added in-memory exportHistory state inside useVideoEditor.ts

• Added support for storing up to 5 previous exports

• Created a new ExportHistory.tsx component

• Added a collapsible "Recent Exports" panel below the export result section

• Added metadata display for:

  • filename
  • format
  • file size
  • output dimensions
  • export timestamp

• Added "Download" button to re-trigger downloads using stored blob URLs

• Added "Clear History" button

• Implemented proper blob URL cleanup when:

  • history entries are evicted
  • history is cleared

• Added session-only history notice:

  • "History is cleared when you close or refresh the page"

• Updated UI styling to match the existing Reframe design system

Testing

• Verified old exports remain downloadable after exporting new videos
• Verified history is limited to 5 entries
• Verified oldest export is removed automatically
• Verified "Clear History" removes all entries
• Verified history resets after page refresh
• Verified responsive layout on mobile view
• Verified bun run lint, bunx tsc --noEmit, and bun run build all pass successfully

Fixes #676

Related Issue

Closes #676

Type of Contribution

• New feature
• GSSoC contribution

Participant Info

• GitHub username: imuniqueshiv
• Contribution level: Intermediate

Screen Recording

Recording / Loom link:

issue_reframe.1.mp4

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

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[github-actions]

👋 Thanks for your PR, @imuniqueshiv!

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

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

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• Linked the issue this PR closes (e.g. Closes #123)
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Happy coding! 🎉

[github-actions]

✅ PR Format Check Passed — @imuniqueshiv

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[magic-peach]

@imuniqueshiv please resolve conflicts

[magic-peach]

Hey @imuniqueshiv! The ExportHistory component looks great — the design is clean and the UX is solid. However there are two regressions in this PR that need to be fixed before merging:

1. M-key mute shortcut removed

The useEffect handling the M key keyboard shortcut to toggle audio mute was deleted. This was intentional functionality — please restore it or confirm it was moved elsewhere (I don't see it in the diff).

2. Blob URL leak in reset

The reset callback no longer revokes the previous export's blob URL:

-  const reset = useCallback(() => {
-    if (result?.blobUrl) URL.revokeObjectURL(result.blobUrl);
+  const reset = useCallback(() => {
     setFile(null);

This will leak memory on every export-then-reset cycle. Please restore the URL.revokeObjectURL call.

3. Minor: inconsistent indentation in VideoEditor.tsx

The new JSX around DownloadResult and ExportHistory has inconsistent indentation — some lines use 2-space, some use 4-space.

Please fix these and push an update!

[imuniqueshiv]

@magic-peach Thanks for the detailed review! I’ve restored the M-key mute shortcut, added the blob URL cleanup back into reset, cleaned up the JSX indentation around DownloadResult and ExportHistory, and rebased the branch on the latest main. I also verified the export history flow locally after rebasing.