Fix wave chunk 1: cross-surface settings signal, dialog scroll-lock, noneRow retired

- lh:settings-saved CustomEvent (the lh:chat-renamed pattern, owner
  ruling): every writer (composer save, SetupDialog save, the settings
  write seam — one dispatch point carrying the section) notifies after a
  successful PUT; every reader re-reads its own seam: ModelControl's
  record read, the Agent section's slots/catalog, and chat.tsx's
  configured state (clearing slots mid-session now surfaces the setup
  CTA without a reload). Self-notifications re-read idempotently.
- MenuShell now announces lh:menu-open/lh:menu-close (still placement-
  only); the settings dialog's content column locks (overflow-hidden,
  count-based) while any menu is open — wheel-scrolling with a dropdown
  down is dead; the re-place-on-scroll fallback stays for un-lockable
  surfaces.
- The settings thinking menus' 'Default' noneRow is retired (owner:
  the unset state can't re-enter once chunk 2's auto-populate lands; no
  unpin is needed).
- Live-caught regression from the MenuShell migration fixed: the
  composer's outside-click handler never learned the portaled menu body
  isn't a container descendant — menu-row pointerdowns counted as
  outside and ATE THE PICK (composer picks have been dead for pointer
  users since 221c99d); rows now carve out via [data-lh-menu], the
  settings sections' discipline.
- Item 4 (resolved-level display for legacy records) deferred to chunk 2
  per owner ruling — the payload omits the level for legacy no-level
  records and DEFAULT_THINKING_ORDER was server-only (now in the core
  barrel via bd68486, exactly the seam chunk 2 needs).

components/chat.tsx

@@ -37,6 +37,8 @@ import { SidebarToggle } from "@/components/sidebar";
 import type { ArtifactPartProps, JobRecord, Phase3, QuestionAnswerData, TeacherUIMessage, TurnUsage } from "@/src/core";
 import { PhaseChip, PhaseDivider, planNodeCount } from "@/components/phase-divider";
 import { findPendingToolCall, phaseAt3, phaseTimeline, streamingToolActivity } from "@/src/core";
+import { slotsConfigured, type ModelsSettings } from "@/src/core";
+import { useSettingsSaved } from "@/components/settings-signal";
 
 /** One width for everything: transcript, cards, and the bottom blob share this column. */
 /**
@@ -300,6 +302,16 @@ export function Chat({
 	// refusal interception share one SetupDialog mount. `configured` is
 	// seeded server-side (slotsConfigured on the record) and flips on Save.
 	const [configured, setConfigured] = useState(initialConfigured);
+	// Cross-surface freshness (fix wave): another surface's models write —
+	// setup save, composer pick, a settings write — re-reads the record so
+	// the setup CTA appears/disappears live (it used to lag until reload).
+	useSettingsSaved((section) => {
+		if (section !== "models") return;
+		fetch("/api/settings")
+			.then((r) => r.json() as Promise<{ settings?: { models?: ModelsSettings } | null } | null>)
+			.then((body) => setConfigured(slotsConfigured(body?.settings?.models)))
+			.catch(() => {});
+	});
 	const [setupOpen, setSetupOpen] = useState(false);
 	const { open: openSettings } = useSettingsDialog();
 	/** The last explicitly-sent draft (composer send, verdict note): the