feat: keyboard waves A/B — global shortcut registry, question row machine, Esc-cancel dictation

Wave A (owner key map): registry in src/core/keyboard.ts + KeyboardShortcuts
provider; Cmd+D dictation, Cmd+K model picker, Shift+Tab thinking cycle,
Cmd+B sidebar, Cmd+Shift+F sessions search, Alt+arrows session cycle,
Alt+Enter open, Cmd+G graph, Cmd+N new, F2 rename, ? cheat sheet. Tab
fully suppressed; Esc chain popover > dictation > abort (local stream).
Esc now CANCELS dictation (discard) — flush stays on Cmd+D/Stop. Owner
bug reports fixed: focus outline removed, Alt+Enter setState-in-render,
Cmd+F graph node search (surface-scoped lh:kbd-find).

Wave B: question dock row machine — arrows walk options + dont-know/Other
with wrap + ring highlight, Space picks (mirrors click semantics), Enter
submits when canSubmit; typing surfaces and in-dock keys keep native
behavior. aria-checked={isSel} restored on option buttons.

docs/keyboard.md records the full map.

components/graph-view.tsx

@@ -598,6 +598,14 @@ export function GraphView() {
 
 	// Search panel state: the query text + the settings section toggle.
 	const [query, setQuery] = useState("");
+	// ⌘F (shortcut wave C): the find event focuses the node search —
+	// surface-scoped, dispatched as lh:kbd-find (only this page listens).
+	const searchInputRef = useRef<HTMLInputElement>(null);
+	useEffect(() => {
+		const onFind = () => searchInputRef.current?.focus();
+		window.addEventListener("lh:kbd-find", onFind);
+		return () => window.removeEventListener("lh:kbd-find", onFind);
+	}, []);
 	// Render settings: SERVER-persisted (data/render-settings.json via
 	// /api/graph/render-settings) — sizes AND the region/physics sections
 	// (user-facing since 2026-09-13; the dev-session era is over). Loaded
@@ -991,6 +999,7 @@ export function GraphView() {
 						<div className="relative">
 							<SearchIcon className="absolute left-2.5 top-1/2 size-3.5 -translate-y-1/2 text-muted-foreground" />
 							<input
+								ref={searchInputRef}
 								value={query}
 								onChange={(e) => setQuery(e.target.value)}
 								placeholder="Search nodes…"