feat(web): fall back to raw upload when MP4 playback fails #6402

Job	Run time
Format (Biome)	9s
Detect Changes	6s
Typecheck	1m 30s
Lint (Biome)	12s
Format (Cargo)	20s
Clippy (aarch64-apple-darwin, macos-latest)	1m 52s
Verify Tauri plugin versions	12s
Clippy (x86_64-pc-windows-msvc, windows-latest)	5m 23s
Rust cache	0s
Build Desktop	0s
	9m 44s

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