use rpc and dataloader for fetching video thumbnails (#1170) #3788

Job	Run time
Detect Changes	8s
Format (Cargo)	30s
Format (Biome)	7s
Typecheck	1m 26s
Lint (Biome)	12s
Build Desktop (x86_64-pc-windows-msvc, windows-latest)	9m 28s
Build Desktop (aarch64-apple-darwin, macos-latest)	4m 35s
Verify Tauri plugin versions	12s
Clippy	-1s
	16m 37s

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