feat: integrate mp4-muxer for video conversion and enhance ExifPanel layout

- Added mp4-muxer dependency to facilitate MP4 video conversion.
- Updated video conversion logic to utilize WebCodecs API for improved performance and reliability.
- Enhanced ExifPanel layout by adjusting grid spacing and item alignment for better visual consistency.

Signed-off-by: Innei <tukon479@gmail.com>

apps/web/package.json

@@ -49,6 +49,7 @@
     "jotai": "2.12.5",
     "masonic": "4.1.0",
     "motion": "12.17.0",
+    "mp4-muxer": "5.2.1",
     "ofetch": "1.4.1",
     "react": "19.1.0",
     "react-blurhash": "0.3.0",