use rpc and dataloader for fetching video thumbnails #3786

Job	Run time
Typecheck	1m 32s
Format (Cargo)	14s
Format (Biome)	7s
Detect Changes	6s
Build Desktop (x86_64-pc-windows-msvc, windows-latest)	9m 31s
Lint (Biome)	12s
Build Desktop (aarch64-apple-darwin, macos-latest)	5m 53s
Verify Tauri plugin versions	11s
Clippy	0s
	17m 46s

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