fix: update local FFmpeg core version to 0.12.10 to fix export crash

[Abhishek2005-ard]

Description

This PR resolves a critical version mismatch issue that was causing the FFmpeg WASM engine to fail to load when falling back to the locally hosted UMD files.

Previously, scripts/download_ffmpeg_umd.js was hardcoded to download @ffmpeg/core@0.12.6, but the application actually uses @ffmpeg/ffmpeg^0.12.10 and validates against SRI hashes for 0.12.10. This mismatch caused the export process to silently fail or throw WASM loading errors.

The download script has been updated to fetch the correct 0.12.10 versions of both ffmpeg-core.js and ffmpeg-core.wasm.

Changes Made

• Updated lines 13 and 17 in scripts/download_ffmpeg_umd.js to change the CDN URL version from @0.12.6 to @0.12.10.
• Triggered a fresh download to replace the outdated local binaries in public/ffmpeg/umd/.

Testing Instructions

1. Run node scripts/download_ffmpeg_umd.js.
2. Start the local dev server using npm run dev.
3. Force the application to use the local FFmpeg UMD files (if testing offline).
4. Upload a video and successfully export it without any loading crashes.

close #1384

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