fix(#1705): add dispose method to prevent blob URL memory leaks

[anshul23102]

Summary

Prevent memory leaks from unreleased blob URLs by adding a dispose mechanism to ExportResult.

Problem (Issue #1705)

Blob URLs created via URL.createObjectURL() are never revoked, causing:

• Memory leaks growing with every export in a single session
• Unbounded memory growth in long-running applications
• Browser performance degradation as memory accumulates

Root Cause

No cleanup mechanism for blob URLs after export completes

Solution

Add dispose() method to ExportResult:

• Method revokes the blob URL when called
• Allows proper cleanup after download/processing
• Prevents memory accumulation in long-session scenarios

Usage Pattern

Changes

• src/lib/types.ts: Added dispose() method to ExportResult
• src/lib/ffmpeg.ts: Implement dispose to call URL.revokeObjectURL()

Testing

• Build passes with TypeScript strict mode ✓

Fixes #1705

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[anshul23102]

Hi @magic-peach team! 👋

I've completed the fix for Issue #1705 (Blob URL memory leaks growing with every export).

What's Included

✅ dispose() method added to ExportResult interface
✅ Proper blob URL cleanup via URL.revokeObjectURL()
✅ Prevents memory accumulation in long-session scenarios
✅ Build passes with TypeScript strict mode

For Review

When reviewing, labels valuable for GSSoC 2026:

• gssoc-approved (essential for GSSoC 2026 credit)
• memory-leak (fixes memory management issue)
• bug (fixes runtime memory leak)

Ready for review! 🚀

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Contributed as part of GSSoC 2026