refactor: remove Workspace/PanelGrid, rename chat → history, add know… #243

Job	Run time
release	15s
build (windows-latest, x86_64-pc-windows-msvc)	5m 47s
build (ubuntu-24.04, x86_64-unknown-linux-gnu)	4m 44s
build (macos-latest, x86_64-apple-darwin)	3m 45s
build (macos-latest, aarch64-apple-darwin)	5m 54s
	20m 25s

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