Add FFmpeg DLLs to PATH and copy to release #6202

Job	Run time
Lint (Biome)	13s
Format (Cargo)	19s
Detect Changes	7s
Format (Biome)	9s
Typecheck	1m 28s
Rust cache (x86_64-apple-darwin, macos-latest)	3m 54s
Rust cache (x86_64-pc-windows-msvc, windows-latest)	23m 26s
Rust cache (aarch64-apple-darwin, macos-latest)	19m 35s
Clippy (x86_64-pc-windows-msvc, windows-latest)	7m 58s
Clippy (aarch64-apple-darwin, macos-latest)	4m 2s
Verify Tauri plugin versions	0s
Build Desktop	0s
	1h 1m 11s

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