graph: the rendering switch — chains view as the home (release polish 2)

The settings Graph section splits into two switches (owner, 2026-10-06):

- EXTRACTION (was the lone "Graph" row): the DATA channel — pipeline,
  auditor, prober graph tools. Key unchanged (graph.enabled), label now
  names its job; off = the graph stops growing, nothing is deleted.
- GRAPH RENDERING (new, graph.rendering, default on): display-only.
  Off = the home's main view is the CHAINS VIEW instead of the canvas;
  data, reasoning-chain model, and the pipeline keep working untouched.

The chains home (components/chains-home.tsx): ChainTableBody in flow —
same body as the overlay, same powers (query + sort, selection, the
delete fence with its confirm dialog), but onClose is absent so the
top-bar X does not render (the table IS the page; ChainTableBody now
takes onClose optionally). The chrome survivors float top-right below
the top bar: Import notes (ALWAYS — the entry-point law) + the cost
pill (GraphCostControl, now exported). The composer blob persists over
everything; the table scrolls CLEAR of it via a fixed pb-40 band (text
under a floating box is noise — unlike the canvas, which runs under).

Pick flow mirrors the overlay contract exactly (home lifts the pick
set; selectMode swaps the bar's confirm to Done). The chip relabels to
"Pick propositions" (no "from the map" — there is no map); while
picking, the chip row hides so the floating bar above the composer is
the one voice. Settings resolve rendering through the one core
resolver + renderingEnabled(); read server-side per navigation, so the
switch applies on the next visit home.

Smoke-verified live (headless browser): chains home renders without the
X, import + search + composer clearance confirmed, pick flow checked 2
propositions -> Done -> chip count -> practice session started with the
graph context carried (2 props, 2 chains), settings restored.

Known follow-ups (flagged, not built): after Done the bar morphs to the
table's Clear/Delete management bar while the chip also shows the count
(two voices, same set — the table's own editor law); /chat/new's pick
chip still says "from the map".

Tests: rendering in factory/sanitize/parse/resolve pins, the GraphSection
render pins (Extraction label + rendering row), the home-variant
chain-table pin (no close X). 1414 pass; tsc, lint, build green.

components/chain-table.tsx

@@ -136,7 +136,10 @@ export function ChainTableBody({
 	onClear: () => void;
 	/** Opens the full-death confirm dialog (owner, 2026-09-29 night). */
 	onDelete: () => void;
-	onClose: () => void;
+	/** Dismisses the overlay (top-bar X). ABSENT = the HOME variant
+	 * (graph rendering off, owner 2026-10-06): the table is the page,
+	 * there is nothing to close, and the X does not render. */
+	onClose?: () => void;
 	/** PRACTICE SELECT (2026-10-04): the floating bar's confirm becomes
 	 *  "Practice these" — no delete fence; the caller owns what the
 	 *  selection becomes. */
@@ -260,6 +263,7 @@ export function ChainTableBody({
 						className="lh-no-drag h-8 w-56 rounded-lg border bg-background pl-8 pr-3 text-xs outline-none placeholder:text-muted-foreground focus:border-ring"
 					/>
 				</div>
+			{onClose && (
 				<button
 					type="button"
 					data-testid="chain-table-close"
@@ -269,6 +273,7 @@ export function ChainTableBody({
 				>
 					<XIcon className="size-4" />
 				</button>
+			)}
 			</TopBar>
 
 			{/* The list: NO per-row lines (owner ruling) — the ONLY horizontal