use rpc and dataloader for fetching video thumbnails #3787

Job	Run time
Typecheck	1m 18s
Format (Biome)	7s
Detect Changes	6s
Format (Cargo)	11s
Lint (Biome)	10s
Build Desktop (aarch64-apple-darwin, macos-latest)	4m 1s
Build Desktop (x86_64-pc-windows-msvc, windows-latest)	10m 0s
Verify Tauri plugin versions	11s
Clippy	0s
	16m 4s

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