Session deletion dialog matches the node deletion dialog: red title, mono name below, checkbox flow

Owner polish round (2026-09-24): the two destructive-confirmation
surfaces must read as ONE design. The node dialog was the good one —
the session dialog now wears its exact look and flow.

components/delete-session-dialog.tsx (full rework):
- Red serif "Delete session?" (was neutral "Delete "title"?") — the
  node dialog's destructive title, text-destructive on font-title 2xl.
- The session name below the title in JetBrains Mono at text-lg,
  NO code-block chrome — the font already says code. (The node
  dialog's name got the same treatment: text-xs bg-muted code block
  dies, mono text-lg line lives. Owner chose below-the-title over
  parens-in-the-title: long titles wrap safely below, never inside
  the 25px headline.)
- TWO OPTION BUTTONS -> CHECKBOX FLOW: the locked two-button design
  (preserve-graph / delete-nodes) collapses to ONE unchecked-by-default
  checkbox "Also remove its graph traces" (accent-primary, the settings
  panel's native-checkbox idiom) carrying the graph-touching option's
  consequence copy verbatim. Unchecked = preserve-graph; checked =
  delete-nodes. The unchecked promise ("everything it added to the
  graph stays unless you check below") lives in the intro line now.
- Bottom row = the node dialog's exact pair: quiet Cancel + destructive
  red Delete (border + text, fill on hover), "Deleting…" on the Delete
  button while busy. Try-again re-derives the mode from the checkbox
  (retry IS Delete pressed again; the checkbox is disabled while busy).
- DeleteSessionBody exported pure (the settings/node dialog body
  pattern) for SSR pins; TRACES_COPY exported for the copy pin.
  DELETE_OPTIONS dies with the two-button design.

Tests: session-context.test.tsx's two-option pins rewritten for the
node-dialog shape (red title, mono name no-chrome, unchecked checkbox
default, red Delete pair, old testids absent); delete-node-dialog
pins the chrome-less text-lg name. 905/905. Live-verified on :3001:
both dialogs render 25px red serif titles, 16px mono names, matching
red Delete buttons; Esc closes both, nothing deleted in verification.

components/delete-node-dialog.tsx

@@ -80,15 +80,12 @@ export function DeleteNodeBody({
 			className="w-[32rem] max-w-[calc(100vw-2rem)] rounded-xl border bg-card p-5 shadow-xl"
 		>
 			<h2 className="font-title text-2xl tracking-tight text-destructive">Delete node?</h2>
-			{/* The node name below the title in JetBrains Mono inline-code
-			    (owner, polish round): topic names are short technical
-			    handles — mono suits them; the serif title keeps the
-			    family voice ("Delete node?", like "Delete "session"?"). */}
+			{/* The node name below the title in JetBrains Mono (owner,
+			    2026-09-24): the name is the payload — mono suits it, and
+			    NO code-block chrome (the font already says code), sized up
+			    to text-lg so it reads. Same shape as the session dialog. */}
 			<div className="mt-1.5">
-				<code
-					data-testid="node-name-code"
-					className="rounded bg-muted px-1.5 py-0.5 font-mono text-xs text-foreground"
-				>
+				<code data-testid="node-name-code" className="font-mono text-lg text-foreground">
 					{node.name}
 				</code>
 			</div>