Docs: cover quick-phrase picker search and keyboard selection

[selfcontained]

Nightly docs audit (diff since b3917437, ~5 commits).

Audited

• Deep-dive (next_focus): docs-pane Agents section vs the Split agents-view into header component + layout/expansion hooks #870 agents-view split (agents-view-header.tsx, use-center-pane-layout.ts, use-expanded-agent.ts, tab bar, center-pane-split.tsx, use-split-pane.ts) — fully clean. Quick Phrases button placement, tab drag/drop (inactive tabs, desktop only), per-agent split persistence, unsplit button on the divider, violet whiteboard dot, and split-pane gear popovers all match the docs.
• Spot-check: faa3924 fenced-code syntax highlighting in feedback cards — no docs claim touches feedback rendering; no change needed, no tip warranted.
• Extract shared useStartupAttachments hook #876 (useStartupAttachments) and Add unit coverage for use-activity #877 (tests) verified refactor/test-only.

Changed

• docs-sections/agents.tsx Quick Phrases section: b894071 rebuilt the picker on cmdk with a search box (auto-focused, filters by label/text) and keyboard selection (arrows + Enter; row click sends; variable phrases open the fill-in dialog). Added a Searching bullet and updated the Injecting bullet.

Deferred

• Next run: docs-pane Media & Sharing section vs media-sidebar tabs (routine rotation; no diff pressure).

🤖 Generated with Claude Code