deletion screen minimal + 'node' as THE UI word (owner ruling)

Owner 2026-09-30: the confirm dialog's pre-flight impact read had to
go — what full death takes is obvious, the per-open fetch flickered,
and richer facts would only confuse as deletion semantics evolve
(rewiring is on the table). The screen is now: Delete node? / Delete
N nodes?, the names in the mono block, one permanence line, Cancel /
Delete. No loading state, no gone state (a 404 mid-run lands in the
honest failure line), no sessions join — the joins prop died too.

The dead path is deleted end to end: GET /api/graph/nodes/[id],
graphNodeImpact (server), nodeDeletionImpact (core) and their tests.

WORDING: node/node(s) is THE UI word for graph objects, standardized
across every surface's copy (owner, same ruling): the dialog titles,
the chain table's counts/search/summary/delete aria-labels, the
practice dialog's cluster counts, selection line, and empty-cluster
hint. Internal identifiers (selection.propositions) unchanged.

Rewritten dialog pins (tests/delete-node-dialog.test.tsx): minimal
contract — no facts/loading/fetch copy, singular/plural titles, the
cap, 409 dock phrasing, busy states, no 'proposition' left in the
dialog.

components/graph-view.tsx

@@ -1538,10 +1538,6 @@ export function GraphView() {
 			    body by the component itself, lives here for state locality. */}
 			<DeleteNodeDialog
 				nodes={deletingNode ? [deletingNode] : null}
-				joins={{
-					sessions: snapshot?.sessions ?? {},
-					fileSources: snapshot?.fileSources ?? {},
-				}}
 				onClose={() => setDeletingNode(null)}
 				onDeleted={(nodeIds, graphRevision) => {
 					// Close the dialog; close the detail card if it pointed here