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>

components/delete-session-dialog.tsx

@@ -4,45 +4,36 @@ import { useEffect, useState } from "react";
 import { createPortal } from "react-dom";
 import type { ChatDeleteMode, ChatListItem } from "@/src/core";
 
-/** The locked two-option design (owner 2026-09-22/23) — plain-language
- *  consequences, the graph-touching option says so. Exported pure for
- *  render pins: the copy is design, not implementation. */
-export const DELETE_OPTIONS: {
-	mode: ChatDeleteMode;
-	testid: string;
-	title: string;
-	body: string;
-}[] = [
-	{
-		mode: "preserve-graph",
-		testid: "delete-option-preserve",
-		title: "Delete the session only",
-		body: "Everything this session added to the graph stays — topics, links, and notes it produced remain untouched.",
-	},
-	{
-		mode: "delete-nodes",
-		testid: "delete-option-nodes",
-		title: "Also remove its graph traces",
-		body: "This session’s topics, links, and events leave the graph too. Topics other sessions or imported notes also cover survive; topics only this session created are removed entirely.",
-	},
-];
+/** The graph-traces checkbox copy (owner, 2026-09-24 flow rework — was
+ *  the delete-nodes option's body in the two-button design): the
+ *  graph-touching consequence says so, shared-topic survival included.
+ *  Exported pure for render pins: the copy is design, not implementation. */
+export const TRACES_COPY = {
+	testid: "delete-traces",
+	checkbox: "delete-traces-checkbox",
+	title: "Also remove its graph traces",
+	body: "This session’s topics, links, and events leave the graph too. Topics other sessions or imported notes also cover survive; topics only this session created are removed entirely.",
+};
 
 /**
- * Session deletion (wave 6 chunk A) — THE destructive-confirmation surface,
- * portaled z-50 like the setup dialog. Two options per the locked design,
- * consequences in plain language; the one that touches the graph says so:
+ * Session deletion (wave 6 chunk A; owner flow rework 2026-09-24) — THE
+ * destructive-confirmation surface, portaled z-50 like the setup dialog,
+ * now in the node dialog's shape (the two must read as one design):
  *
- *   preserve-graph  the session record, its jobs, and its extraction
- *                   bookkeeping die; the graph keeps every contribution.
- *   delete-nodes    the session's ledger traces go too — shared topics
- *                   survive (other sessions / imported notes still
- *                   reference them), topics only this session created
- *                   are removed entirely.
+ *   - red serif title "Delete session?", the session name below it in
+ *     JetBrains Mono, sized up, no code-block chrome;
+ *   - ONE unchecked-by-default checkbox "Also remove its graph traces"
+ *     (unchecked = preserve-graph: the session record, its jobs, and its
+ *     extraction bookkeeping die; the graph keeps every contribution.
+ *     checked = delete-nodes: the session's ledger traces go too);
+ *   - a bottom row Cancel + destructive-red Delete, exactly the node
+ *     dialog's pair.
  *
  * Retryable failures render honestly with a Try-again: 409 turn_in_flight /
  * jobs_running ("wait for running work") and 503 extraction_winding_down
  * ("in a moment") both clear on their own — the server's error line is
- * already written for the user; we show it verbatim.
+ * already written for the user; we show it verbatim. Try-again is just
+ * Delete pressed again — the mode re-derives from the checkbox.
  */
 export function DeleteSessionDialog({
 	chat,
@@ -55,15 +46,19 @@ export function DeleteSessionDialog({
 	/** Success path — the sidebar owns navigation + list patching. */
 	onDeleted: (id: string, mode: ChatDeleteMode, graphRevision: number) => void;
 }) {
-	const [busy, setBusy] = useState<ChatDeleteMode | null>(null);
-	// The failure carries the mode it came from — Try-again re-runs THAT
-	// mode (busy is back to null by then, so it can't be read off busy).
-	const [failure, setFailure] = useState<{ code: string; error: string; mode: ChatDeleteMode } | null>(null);
+	const [traces, setTraces] = useState(false);
+	const [busy, setBusy] = useState(false);
+	// Retry IS pressing Delete again: the mode always derives from the
+	// checkbox's current state (a toggle between failure and retry is a
+	// change of intent, honored as such — the checkbox is disabled while
+	// busy, so no mid-flight switches).
+	const [failure, setFailure] = useState<{ code: string; error: string } | null>(null);
 
 	// Fresh state per session: closing resets, opening a new chat starts clean.
 	useEffect(() => {
 		if (!chat) {
-			setBusy(null);
+			setTraces(false);
+			setBusy(false);
 			setFailure(null);
 		}
 	}, [chat]);
@@ -81,9 +76,10 @@ export function DeleteSessionDialog({
 		return () => window.removeEventListener("keydown", onKeyDown);
 	}, [chat, onClose]);
 
-	const run = async (mode: ChatDeleteMode) => {
+	const run = async () => {
 		if (!chat || busy) return;
-		setBusy(mode);
+		const mode: ChatDeleteMode = traces ? "delete-nodes" : "preserve-graph";
+		setBusy(true);
 		setFailure(null);
 		try {
 			const res = await fetch(`/api/chats/${chat.id}?mode=${mode}`, { method: "DELETE" });
@@ -96,18 +92,14 @@ export function DeleteSessionDialog({
 			if (!res.ok) {
 				// 409 (turn/jobs running) and 503 (extraction winding down) are
 				// both retryable — keep the dialog open, show the server's line.
-				setFailure({
-					code: body.code ?? "error",
-					error: body.error ?? `Delete failed (${res.status})`,
-					mode,
-				});
-				setBusy(null);
+				setFailure({ code: body.code ?? "error", error: body.error ?? `Delete failed (${res.status})` });
+				setBusy(false);
 				return;
 			}
 			onDeleted(chat.id, mode, body.graphRevision ?? 0);
 		} catch {
-			setFailure({ code: "network", error: "Delete failed — network error. Try again.", mode });
-			setBusy(null);
+			setFailure({ code: "network", error: "Delete failed — network error. Try again." });
+			setBusy(false);
 		}
 	};
 
@@ -120,65 +112,120 @@ export function DeleteSessionDialog({
 				if (!busy) onClose();
 			}}
 		>
-			<div
-				role="dialog"
-				aria-modal="true"
-				aria-label="Delete session"
-				data-testid="delete-session-dialog"
-				onClick={(e) => e.stopPropagation()}
-				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">Delete “{chat.title}”?</h2>
-				<p className="mt-2 text-sm text-muted-foreground">
-					This permanently removes the session — its messages, background jobs, and extraction records. Pick how
-					far it reaches:
-				</p>
-				<div className="mt-4 flex flex-col gap-2">
-					{DELETE_OPTIONS.map((option) => (
-						<button
-							key={option.mode}
-							type="button"
-							data-testid={option.testid}
-							disabled={busy !== null}
-							onClick={() => void run(option.mode)}
-							className="flex flex-col items-start rounded-lg border border-border/60 px-4 py-3 text-left transition-colors hover:bg-accent disabled:opacity-40"
-						>
-							<span className="text-sm text-foreground">{option.title}</span>
-							<span className="mt-1 text-xs text-muted-foreground">{option.body}</span>
-						</button>
-					))}
-				</div>
-				{failure && (
-					<div
-						role="alert"
-						data-testid="delete-failure"
-						className="mt-3 rounded-sm border border-border/60 px-3 py-2 text-xs"
-					>
-						<span className="text-foreground">{failure.error}</span>
-						<button
-							type="button"
-							data-testid="delete-retry"
-							onClick={() => failure && void run(failure.mode)}
-							disabled={busy !== null}
-							className="ml-3 text-xs text-foreground underline-offset-2 hover:underline disabled:opacity-40"
-						>
-							Try again
-						</button>
-					</div>
-				)}
-				<div className="mt-4 flex justify-end">
-					<button
-						type="button"
-						data-testid="delete-cancel"
-						onClick={onClose}
-						disabled={busy !== null}
-						className="rounded-sm px-3 py-1.5 text-xs text-muted-foreground transition-colors hover:text-foreground disabled:opacity-40"
-					>
-						{busy ? "Deleting…" : "Cancel"}
-					</button>
-				</div>
-			</div>
+			<DeleteSessionBody
+				chat={chat}
+				traces={traces}
+				busy={busy}
+				failure={failure}
+				onTraces={(next) => setTraces(next)}
+				onClose={onClose}
+				onRun={() => void run()}
+			/>
 		</div>,
 		document.body,
 	);
+}
+
+/** The dialog's pure body — exported for SSR pins (the settings-dialog /
+ *  node-dialog body pattern). The wrapper owns state + effects + portal. */
+export function DeleteSessionBody({
+	chat,
+	traces,
+	busy,
+	failure,
+	onTraces,
+	onClose,
+	onRun,
+}: {
+	chat: Pick<ChatListItem, "id" | "title">;
+	/** The graph-traces checkbox — unchecked by default (preserve-graph). */
+	traces: boolean;
+	busy: boolean;
+	failure: { code: string; error: string } | null;
+	onTraces: (next: boolean) => void;
+	onClose: () => void;
+	onRun: () => void;
+}) {
+	return (
+		<div
+			role="dialog"
+			aria-modal="true"
+			aria-label="Delete session"
+			data-testid="delete-session-dialog"
+			onClick={(e) => e.stopPropagation()}
+			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 session?</h2>
+			{/* The session name below the title in JetBrains Mono (owner,
+			    2026-09-24): no code-block chrome — the font already says
+			    code — sized up to text-lg. Same shape as the node dialog. */}
+			<div className="mt-1.5">
+				<code data-testid="session-name-code" className="font-mono text-lg text-foreground">
+					{chat.title}
+				</code>
+			</div>
+			<p className="mt-2 text-sm text-muted-foreground">
+				This permanently removes the session — its messages, background jobs, and extraction records. Everything
+				it added to the graph stays unless you check below. This cannot be undone.
+			</p>
+			<label
+				data-testid={TRACES_COPY.testid}
+				className="mt-4 flex cursor-pointer items-start gap-2.5 rounded-lg border border-border/60 px-4 py-3"
+			>
+				<input
+					type="checkbox"
+					data-testid={TRACES_COPY.checkbox}
+					checked={traces}
+					onChange={(e) => onTraces(e.target.checked)}
+					disabled={busy}
+					className="mt-0.5 size-4 shrink-0 accent-primary"
+				/>
+				<span className="min-w-0">
+					<span className="block text-sm text-foreground">{TRACES_COPY.title}</span>
+					<span className="mt-1 block text-xs text-muted-foreground">{TRACES_COPY.body}</span>
+				</span>
+			</label>
+			{failure && (
+				<div
+					role="alert"
+					data-testid="delete-failure"
+					className="mt-3 rounded-sm border border-border/60 px-3 py-2 text-xs"
+				>
+					<span className="text-foreground">{failure.error}</span>
+					<button
+						type="button"
+						data-testid="delete-retry"
+						onClick={onRun}
+						disabled={busy}
+						className="ml-3 text-xs text-foreground underline-offset-2 hover:underline disabled:opacity-40"
+					>
+						Try again
+					</button>
+				</div>
+			)}
+			{/* The node dialog's exact bottom row: quiet Cancel, destructive
+			    red Delete (border + text, fill on hover — the app's
+			    established destructive pair). */}
+			<div className="mt-4 flex justify-end gap-2">
+				<button
+					type="button"
+					data-testid="delete-cancel"
+					onClick={onClose}
+					disabled={busy}
+					className="rounded-sm px-3 py-1.5 text-xs text-muted-foreground transition-colors hover:text-foreground disabled:opacity-40"
+				>
+					Cancel
+				</button>
+				<button
+					type="button"
+					data-testid="delete-confirm"
+					onClick={onRun}
+					disabled={busy}
+					className="rounded-sm border border-destructive/50 bg-destructive/10 px-3 py-1.5 text-xs text-destructive transition-colors hover:bg-destructive/20 disabled:opacity-40"
+				>
+					{busy ? "Deleting…" : "Delete"}
+				</button>
+			</div>
+		</div>
+	);
 }

tests/delete-node-dialog.test.tsx

@@ -73,10 +73,14 @@ describe("DeleteNodeDialog (thin SSR)", () => {
 	it("the body at loading: the frame + the pre-flight read pending (effects never fire in SSR — the wrapper's own state)", () => {
 		const html = bodyAt("loading");
 		assert.match(html, /data-testid="delete-node-dialog"/);
-		// (owner, polish round) the serif title is just "Delete node?" in
-		// destructive red; the NAME rides below in JetBrains Mono code.
+		// (owner, 2026-09-24) the serif title is just "Delete node?" in
+		// destructive red; the NAME rides below in JetBrains Mono, sized up
+		// (text-lg), NO code-block chrome — same shape as the session dialog.
 		assert.match(html, /Delete node\?/);
 		assert.match(html, /text-destructive/); // the red title
+		const name = html.match(/data-testid="node-name-code"[^>]*>/)?.[0] ?? "";
+		assert.match(name, /font-mono text-lg/); // bigger, mono
+		assert.ok(!name.includes("bg-muted"), "no code-block chrome — the font already says code")
 		assert.match(html, /data-testid="node-name-code"[^>]*>Kepler&#x27;s three laws</); // the name in mono
 		assert.match(html, /data-testid="node-impact-loading"/);
 	});

tests/session-context.test.tsx

@@ -5,7 +5,7 @@ import { renderToStaticMarkup } from "react-dom/server";
 import { describe, it } from "node:test";
 import assert from "node:assert/strict";
 import { RenameRow, SessionRow } from "../components/sidebar.tsx";
-import { DELETE_OPTIONS, DeleteSessionDialog } from "../components/delete-session-dialog.tsx";
+import { DeleteSessionBody, DeleteSessionDialog, TRACES_COPY } from "../components/delete-session-dialog.tsx";
 import type { ChatListItem } from "../src/core/index.ts";
 
 /**
@@ -51,7 +51,7 @@ describe("RenameRow — the inline rename surface", () => {
 	});
 });
 
-describe("DeleteSessionDialog — the locked two-option copy (portals no-op in SSR; pin the pure seam)", () => {
+describe("DeleteSessionDialog — the node-dialog shape (owner flow rework 2026-09-24; portals no-op in SSR; pin the pure body)", () => {
 	it("closed (chat=null) renders nothing", () => {
 		const html = renderToStaticMarkup(
 			<DeleteSessionDialog chat={null} onClose={() => {}} onDeleted={() => {}} />,
@@ -59,18 +59,68 @@ describe("DeleteSessionDialog — the locked two-option copy (portals no-op in S
 		assert.equal(html, "");
 	});
 
-	it("exactly two options, both modes covered, consequences in plain language", () => {
-		assert.equal(DELETE_OPTIONS.length, 2);
-		const modes = DELETE_OPTIONS.map((o) => o.mode).sort();
-		assert.deepEqual(modes, ["delete-nodes", "preserve-graph"]);
+	it("red serif title 'Delete session?', the session name below in mono, sized up, no code-block chrome", () => {
+		const html = renderToStaticMarkup(
+			<DeleteSessionBody
+				chat={{ id: "c1", title: "Orbital mechanics" }}
+				traces={false}
+				busy={false}
+				failure={null}
+				onTraces={() => {}}
+				onClose={() => {}}
+				onRun={() => {}}
+			/>,
+		);
+		assert.match(html, /Delete session\?/);
+		assert.match(html, /text-destructive[^"]*">Delete session\?</); // the red title
+		// the name: mono, text-lg (sized up), NO bg-muted code-block chrome
+		const name = html.match(/data-testid="session-name-code"[^>]*>/)?.[0] ?? "";
+		assert.match(name, /font-mono text-lg/);
+		assert.ok(!name.includes("bg-muted"), "no code-block chrome");
+		assert.match(html, /data-testid="session-name-code"[^>]*>Orbital mechanics</);
 	});
 
-	it("the graph-touching option says so; the session-only option promises the graph stays", () => {
-		const preserve = DELETE_OPTIONS.find((o) => o.mode === "preserve-graph");
-		const nodes = DELETE_OPTIONS.find((o) => o.mode === "delete-nodes");
-		assert.ok(preserve?.body.includes("graph stays"));
-		assert.ok(nodes?.body.includes("leave the graph"));
-		// shared-topics survival is stated on the destructive option
-		assert.ok(nodes?.body.includes("survive"));
+	it("one unchecked-by-default checkbox for the graph traces — the graph-touching consequence says so", () => {
+		const html = renderToStaticMarkup(
+			<DeleteSessionBody
+				chat={{ id: "c1", title: "Orbital mechanics" }}
+				traces={false}
+				busy={false}
+				failure={null}
+				onTraces={() => {}}
+				onClose={() => {}}
+				onRun={() => {}}
+			/>,
+		);
+		// unchecked by default (preserve-graph) — React SSR omits the
+		// attribute when false, so pin its ABSENCE on the rendered input
+		assert.ok(!/"checked"/.test(html), "unchecked by default");
+		// plain-language consequences on the checkbox body
+		assert.ok(html.includes(TRACES_COPY.title));
+		assert.ok(html.includes("leave the graph too"));
+		assert.ok(html.includes("survive"));
+		// the old two-button design is gone
+		assert.ok(!html.includes("delete-option-preserve"));
+		assert.ok(!html.includes("delete-option-nodes"));
+	});
+
+	it("bottom row matches the node dialog: quiet Cancel + destructive-red Delete", () => {
+		const html = renderToStaticMarkup(
+			<DeleteSessionBody
+				chat={{ id: "c1", title: "Orbital mechanics" }}
+				traces={true}
+				busy={true}
+				failure={null}
+				onTraces={() => {}}
+				onClose={() => {}}
+				onRun={() => {}}
+			/>,
+		);
+		assert.match(html, /data-testid="delete-cancel"[^>]*>Cancel</);
+		const del = html.match(/data-testid="delete-confirm"[^>]*>/)?.[0] ?? "";
+		assert.match(del, /border-destructive\/50/);
+		assert.match(html, /data-testid="delete-confirm"[^>]*>Deleting…</); // busy label on Delete
+		// the checkbox survives a busy render (disabled, not unmounted)
+		assert.match(html, /data-testid="delete-traces-checkbox"[^>]*disabled=""/);
 	});
 });