graph: the MINIMAL home — the no-graph home, take two (release polish 2.2)

The chains-as-home experiment is retired (owner, 2026-10-06): dragging
the table out of its overlay home caused every mess we saw — checkboxes
by default, the bar/pill collision, the clearance band. The eventual
plan is the DATA VIEW as home; until that is designed and built, the
rendering-off home is deliberately minimal:

- The SAME composer blob home already floats — teach/practice switcher
  and pick pill untouched.
- The graph chrome's survivors in the graph view's OWN places: the
  top-right column — actions row (Chains + Import, the same 36px band
  pills) with the cost pill BELOW it. Import always renders (the
  entry-point law). No node search, no render gear (canvas things).
- A quiet centered summary (KnowledgeSummary, a pure body — pinned by
  the render suite): propositions · chains, teaching · practice session
  counts, the imported-sources list as truncated muted rows; the empty
  knowledge base says so and names the import entry point. Biased up
  off the composer (pb-40), pointer-events-none.
- NO recent sessions (the sidebar owns that, owner ruling).

The chain table returns to overlay-only duty: ChainTableBody's
onClose-optional and topBarExtra experiment hooks are reverted, and
components/chains-home.tsx is deleted. MinimalHome renders the STANDARD
ChainTableOverlay behind its Chains button — the pick flow mirrors
GraphView's contract verbatim (chainSelectOpen raises the overlay in
select mode; Done reports the lifted pick set down).

Smoke-verified live, twice: the summary shows real counts (262 props ·
160 chains, 195 teaching · 17 practice, 4 source paths); overlay
open/close via button + X; pick flow — cluster check → bar "23 nodes →
17 chains · Clear · Done" → uncheck 2 props → Done → chip "21
propositions selected"; practice session starts from the composer;
settings restore returns the canvas home. (First run's "select mode
missing" was a tester artifact: the bar is selection-gated and prop
checkboxes render only when expanded — both confirmed working.)

1417 tests (new KnowledgeSummary pins); tsc, lint, build green.

components/home.tsx

@@ -4,7 +4,7 @@ import { useEffect, useMemo, useRef, useState } from "react";
 import { useRouter } from "next/navigation";
 import { CornerDownLeftIcon, DumbbellIcon } from "lucide-react";
 import { GraphView } from "@/components/graph-view";
-import { ChainsHome } from "@/components/chains-home";
+import { MinimalHome } from "@/components/minimal-home";
 import { SetupDialog } from "@/components/setup-dialog";
 import { useStrongKeyless, useZeroKeys, ZeroKeysPill } from "@/components/setup-cta";
 import { DictationBar, joinDictation, useDictation } from "@/components/dictation";
@@ -163,8 +163,9 @@ export function Home({
 			    padding on any side; it runs from the sidebar to the right edge
 			    and from the bottom to the top, under everything else. With
 			    rendering OFF (graph.rendering, owner 2026-10-06) it is the
-			    CHAINS VIEW — the same table as the overlay, in flow; data,
-			    extraction, and the pick flow are untouched. */}
+			    MINIMAL HOME — a quiet knowledge-base summary + the graph
+			    chrome's survivors; data, extraction, and the pick flow are
+			    untouched, and the chain table stays behind its button. */}
 			<main className="absolute inset-0">
 				{rendering ? (
 					<GraphView
@@ -174,7 +175,7 @@ export function Home({
 						onChainSelectClose={() => setChainSelectOpen(false)}
 					/>
 				) : (
-					<ChainsHome
+					<MinimalHome
 						chainSelectOpen={chainSelectOpen}
 						practiceSelection={pickedIds}
 						onPracticeSelectionChange={setPracticeProps}
@@ -207,10 +208,7 @@ export function Home({
 					    send consumes it). Practice mode with nothing picked
 					    shows the pick HINT so the affordance is discoverable;
 					    teaching mode with nothing picked renders nothing. */}
-					{/* While PICKING in the chains home the chip row hides
-					    (owner, 2026-10-06): the floating bar above the composer
-					    already carries count + Clear + Done — one voice, not two. */}
-					{(practiceProps.length > 0 || mode === "practice") && !(rendering === false && chainSelectOpen) && (
+					{(practiceProps.length > 0 || mode === "practice") && (
 						<div className="mb-2 flex items-center justify-start gap-1.5">
 							<button
 								type="button"