Wave 6 chunk B: the embeddings surfaces — picker, re-embed gate, gray-outs, cost pill

- Settings ▸ Graph grows the embedding-model picker (graph-row-embedding-model):
  GET /api/models/embeddings' live-federated BYOK catalog (re-fetched on mount
  and every settings save), rows priced from EMBEDDING_PRICES ("$x.xx/1M in",
  honestly "—" when unlisted), ids shown AND stored as full colon-safe slugs
  (openrouter:liquid/…:free is never split), plus an Unset row writing null.
  Empty catalog = nothing keyed: the trigger BECOMES the deep link to Keys
  ("Add a provider key first…") — and deep-links fired while the dialog is
  open now actually switch sections (initialSection was read once at mount;
  the body follows it now — pre-existing gap, first exercised by this link).
- Re-embed gate (owner design): picking a model that differs from the stored
  one holds the write behind a confirm strip carrying the honest node count
  from GET /api/graph; zero propositions skip the strip (nothing to re-embed)
  and land directly. Unset never confirms — the port just stops resolving.
  The copy says the re-embed runs with the next background pass (the staleness
  machinery — a settings PUT alone never triggers it; no server endpoints
  were added).
- Gray-out, the searchStatus precedent: with no model configured, the ladder
  rungs Embedding/Clustering/Labeling dim + disable with a "Needs an
  embedding model" hint (master switch stays lit), and the stats-bar
  GraphContextControl swaps its slider for a dimmed deep-link button to the
  Graph section. Loading never grays; every settings save re-reads (signal).
- Cost chrome: the pipeline popover grows the Embeddings stage row
  (costs.stages.embedding, wave 6's folded stage — "— · 0 in / 0 out" until
  runs exist, same as its siblings).
- Master's ride-along: the core-barrel ChatDeleteMode comment now says two
  type-only things (it always exported both).

Gates: tsc clean, 912/912 (8 new: price lines, model-dependency predicate,
unset/set SSR dimming; 2 ladder fixtures updated to the new no-model
semantics), lint 0, build ok. Live-verified on :3001: unset deep-link →
graph section, menu pricing + colon-safety (37 options), confirm strip with
"20 propositions", Cancel keeps the record, Unset writes immediately,
in-dialog empty-catalog deep-link lands Keys, Embeddings row in the popover.

components/settings/settings-dialog.tsx

@@ -150,6 +150,13 @@ export function SettingsDialogBody({
 		};
 	}, []);
 	const [active, setActive] = useState<SectionId>(initialSection);
+	// A deep-link fired while the dialog is ALREADY open (wave 6: the
+	// embedding picker's "Add a provider key first…" lands on Keys from
+	// inside the dialog) changes initialSection under our feet — follow it,
+	// or the link silently does nothing.
+	useEffect(() => {
+		setActive(initialSection);
+	}, [initialSection]);
 
 	// Fetch once per dialog mount. 200 {settings: null} is FIRST BOOT
 	// (no record = factory everything), not a failure — the error state is