feat(web): code block toggles, move-to-background, subagent panel pro… #257

Job	Run time
Wait for CI and Nix Build	4m 41s
Release	4m 27s
Update Homebrew tap	0s
Publish VS Code extension	0s
Cut desktop release tag	-1s
Release lane summary	14s
Native release artifact	-1s
Publish native release assets	-1s
Redeploy CDN	-1s
Deploy docs	-1s
Verify release consistency	-1s
	9m 16s

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