feat: live bottleneck indicator on the Activity dashboard #942

Job	Run time
cargo deny	45s
cargo test + clippy (ubuntu-latest)	8m 23s
ui build + lint + unit	1m 54s
tauri compile (macos-latest)	3m 23s
tauri compile (ubuntu-latest)	3m 28s
cargo test + clippy (windows-latest)	21m 33s
cargo test + clippy (macos-latest)	10m 22s
tauri compile (windows-latest)	5m 15s
rustfmt	6s
	55m 9s

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