ui: the chat comeback — side-based authorship, restored quotes, tucked whys

Blockquotes: the callout override had displaced Streamdown's own styled
blockquote component, so plain quotes rendered as bare unstyled text
since that commit. The pass-through branch now restores Streamdown's
verbatim classes (border-l-4, muted italic).

Explanations tucked for ALL questions (owner): the prediction's Why /
Hide-why toggle is universal — every quiz answered card sits its
explanation behind the same collapsed button. Same pattern, one law.

The thinking row's rhythm: my-1 -> my-3. The 4px margin hugged the
options on non-graded answered cards (owner report); 12px matches the
card's mt-2/mt-3 spacing grammar everywhere the row renders.

Side-based authorship (owner round, 2026-10-07): the document shape
blurred user into agent — three left-rail idioms (user text, user
thinking, quoted prose) collided once quotes rendered. User rows go
RIGHT: 'You' messages and practice thinking cards hug the right edge at
85% width with the rail mirrored (border-r), text still reading
left-to-right. In-card thinking (inside the answered card, the agent's
context) stays left. Transcript thinking rows arrive EXPANDED — the
thinking was clearly sent. Cmd+T (toggle-user-thinking, chat scope,
cheat-sheet row) sets every user-thinking row to one state via a module
store: explicit sets stomp individual toggles, late mounts honor the
last set (the state initializer reads the store, so static render
reflects it too).

components/answered-card.tsx

@@ -145,11 +145,11 @@ export function AnsweredCard({ answer }: { answer: QuestionAnswerData }) {
 			{/* px-3→removed: card p-4 + box px-3 double-inset sat the "Why" label deeper
 			    than the option box edges (owner, round 3). Sides flush with everything
 			    else; py-2 stays for vertical air. */}
-			{isQuiz && answer.explanation && answer.questionType === "predict" ? (
-				/* The TUCKED explanation (owner 2026-10-03): a prediction's
-				   verdict shows, but the explanation sits collapsed — viewable,
-				   never center stage. The teaching that follows resolves the
-				   prediction; THAT is the real explanation. */
+			{isQuiz && answer.explanation && (
+				/* The TUCKED explanation — ALL questions (owner, 2026-10-07): the
+				   verdict shows, the explanation sits collapsed behind the Why
+				   toggle — viewable, never center stage. Identical to the
+				   prediction pattern it generalizes (owner, 2026-10-03). */
 				<div className="mt-2" data-testid="tucked-explanation">
 					<button
 						type="button"
@@ -161,20 +161,12 @@ export function AnsweredCard({ answer }: { answer: QuestionAnswerData }) {
 					{whyOpen && (
 						<div className="mt-1.5 rounded-lg bg-muted py-2 text-sm text-foreground/50">
 							<span className="font-medium text-muted-foreground">Why: </span>
+							{/* The markdown wrapper must go truly inline — a block <p> after the
+							   "Why:" label created the oversized leading gap (owner's fix list). */}
 							<MessageResponse className="inline [&_p]:inline [&_p]:m-0">{answer.explanation}</MessageResponse>
 						</div>
 					)}
 				</div>
-			) : (
-				isQuiz &&
-				answer.explanation && (
-					<div className="mt-2 rounded-lg bg-muted py-2 text-sm text-foreground/50">
-						<span className="font-medium text-muted-foreground">Why: </span>
-						{/* The markdown wrapper must go truly inline — a block <p> after the
-						   "Why:" label created the oversized leading gap (owner's fix list). */}
-						<MessageResponse className="inline [&_p]:inline [&_p]:m-0">{answer.explanation}</MessageResponse>
-					</div>
-				)
 			)}
 
 			{/* The explain reveal (owner ruling 2026-09-27): the committed answer

components/chat.tsx

@@ -31,7 +31,15 @@ import { useFieldCycle } from "@/components/field-cycle";
 import { JobsContext } from "@/components/jobs-context";
 import { StatsBar } from "@/components/stats-bar";
 import { useServerEvent, useServerResync } from "@/components/server-events";
-import { isProviderKeyRefusal, needsContinuation, type ChatInput, type ChatSettings, type LhMessage, type ModelSlotName } from "@/src/core";
+import {
+	isProviderKeyRefusal,
+	kbdEventForAction as kbdEventForChat,
+	needsContinuation,
+	type ChatInput,
+	type ChatSettings,
+	type LhMessage,
+	type ModelSlotName,
+} from "@/src/core";
 import { PlanBlock, PlanPopup, latestTree } from "@/components/plan-block";
 import { PlanMarginalia, planExists } from "@/components/plan-window";
 import { MermaidOverlay, SessionMermaidContext } from "@/components/session-overlay";
@@ -63,6 +71,7 @@ import {
 	quizNeedsReveal,
 } from "@/src/core";
 import { ReadingThinkingField } from "@/components/reading-thinking";
+import { currentUserThinkingOpen, setAllUserThinkingOpen } from "@/components/thinking-block";
 import { slotsConfigured, type ModelsSettings } from "@/src/core";
 import { useSettingsSaved } from "@/components/settings-signal";
 
@@ -493,6 +502,15 @@ export function Chat({
 	 * separate `readingThinking` field. Reset per pending question. */
 	const [readingThinking, setReadingThinking] = useState("");
 	const readingThinkingRef = useRef("");
+
+	// ⌘T (toggle-user-thinking, owner round 2026-10-07): set EVERY user
+	// thinking row to one state — transcript rows default open, so the
+	// first press collapses everything, the second re-expands.
+	useEffect(() => {
+		const onToggle = () => setAllUserThinkingOpen(!currentUserThinkingOpen());
+		window.addEventListener(kbdEventForChat("toggle-user-thinking"), onToggle);
+		return () => window.removeEventListener(kbdEventForChat("toggle-user-thinking"), onToggle);
+	}, []);
 	const applyReadingThinking = useCallback((v: string) => {
 		readingThinkingRef.current = v;
 		setReadingThinking(v);
@@ -1379,7 +1397,15 @@ export function Chat({
 										    User text renders plain — the model's LaTeX pipeline is not
 										    applied to learner-authored text ($ stays $, no surprises).
 										    Rendered WITHOUT the Message wrapper — that is the bubble. */
-											<div data-testid="user-message" className="my-1 w-full border-l-2 border-muted-foreground/30 pl-[calc(3ch-2px)] font-ui text-xs">
+											<div
+										data-testid="user-message"
+										/* SIDE-BASED AUTHORSHIP (owner round, 2026-10-07): the
+										    document shape blurred user into agent — three left-rail
+										    idioms (user text, user thinking, quoted prose) collided.
+										    User rows go RIGHT: mirrored rail, ~85% width, text still
+										    reading left-to-right (the chat convention). */
+										className="my-1 ml-auto w-[85%] border-r-2 border-muted-foreground/30 pr-[calc(3ch-2px)] font-ui text-xs"
+									>
 												{/* The rail GROUPS (owner round 4, 2026-10-05): the YOU heading
 												    sits INSIDE the rail, same mono-xs register and same 1ch
 												    rail as the thinking rows — one quote geometry. */}

components/md-blocks.tsx

@@ -335,7 +335,21 @@ export function parseAlertMarker(children: ReactNode): ParsedAlert | null {
 export function MarkdownBlockquote(props: ComponentProps<"blockquote"> & ExtraProps) {
 	const { children, node, ...rest } = props;
 	const alert = parseAlertMarker(children);
-	if (!alert) return <blockquote {...rest}>{children}</blockquote>;
+	if (!alert) {
+		// Plain quote — Streamdown's own styling, restored by hand: overriding
+		// `blockquote` displaced its styled component (the classes below are
+		// its verbatim defaults), and bare <blockquote> rendered unstyled
+		// (owner report, 2026-10-07).
+		return (
+			<blockquote
+				{...rest}
+				className="my-4 border-l-4 border-muted-foreground/30 pl-4 text-muted-foreground italic"
+				data-streamdown="blockquote"
+			>
+				{children}
+			</blockquote>
+		);
+	}
 	return (
 		<div
 			data-testid="md-callout"

components/practice-cards.tsx

@@ -291,7 +291,10 @@ function MetadataPopover({
 
 export function ThinkingCard({ data }: { data: PracticeThinkingData }) {
 	// The unified row (owner rounds, 2026-10-05): one style, one label —
-	// collapsed arrival, "Your thinking", 50%-italic quote block on expand.
-	// Legacy records' commit flag is deliberately unread (one lane now).
-	return <ThinkingBlock testId="thinking-card" label="YOUR THINKING" text={data.text} />;
+	// 50%-italic quote block on expand. Legacy records' commit flag is
+	// deliberately unread (one lane now). A TRANSCRIPT row (owner round,
+	// 2026-10-07): mirrored to the right side, arriving expanded.
+	return (
+		<ThinkingBlock testId="thinking-card" label="YOUR THINKING" text={data.text} mirror defaultOpen />
+	);
 }

components/thinking-block.tsx

@@ -1,35 +1,86 @@
 "use client";
 
-import { useState } from "react";
+import { useEffect, useRef, useState } from "react";
 import { ChevronDownIcon } from "lucide-react";
 import { cn } from "@/lib/utils";
 
 /** The unified user-thinking row (owner round, 2026-10-05): ONE visual
  *  language for every surface where the learner's own thinking renders —
  *  practice thinking traces, the reading channel lifted above the answered
- *  card, the quiz answer's thinking inside its container. It arrives
- *  COLLAPSED as a trigger row in the exact register of the agent's
- *  reasoning rows (muted label + chevron + hover affordance); expanding
- *  opens the quote block — rail, 50% opacity, italics. The italics + the
- *  half-opacity text are the inner-voice signature; the rail marks it as
- *  learner material. No shell, no border: document material, full width.
+ *  card, the quiz answer's thinking inside its container. It arrives as
+ *  a trigger row in the exact register of the agent's reasoning rows
+ *  (muted label + chevron + hover affordance); expanding opens the quote
+ *  block — rail, 50% opacity, italics. The italics + the half-opacity
+ *  text are the inner-voice signature; the rail marks it as learner
+ *  material. No shell, no border: document material, full width.
  *
  *  The glance-level law (owner): user thinking = rail + 50% italic;
- *  agent thinking = no rail. */
+ *  agent thinking = no rail.
+ *
+ *  SIDE-BASED AUTHORSHIP (owner round, 2026-10-07): transcript-level rows
+ *  go RIGHT — mirrored rail (border-right), block hugging the right edge
+ *  at ~85% width, text still reading left-to-right. In-card rows (inside
+ *  the answered card, the agent's context) stay left. `mirror` selects
+ *  the side; `defaultOpen` marks the transcript rows, which arrive
+ *  EXPANDED (owner: clearly conveyed that the thinking was sent).
+ *
+ *  ⌘T (toggle-user-thinking) sets EVERY row to one state via the module
+ *  store below — one source of truth, no provider tree: rows subscribe on
+ *  mount; explicit sets (and only those) stomp individual toggles. */
+
+// ── The ⌘T store (module-scope, one per page load) ─────────────────────────
+// null = "rows run their own defaults" (the pre-toggle state); the first ⌘T
+// resolves from `true` (transcript rows default open) and then alternates.
+let allUserThinkingOpen: boolean | null = null;
+const userThinkingListeners = new Set<(open: boolean) => void>();
+
+export function currentUserThinkingOpen(): boolean {
+	return allUserThinkingOpen ?? true;
+}
+
+/** The row's starting state: an explicit ⌘T set wins over the row's own
+ *  default (late mounts honor the last set — same path as the live sync,
+ *  readable at render time so static SSR reflects the store too). */
+function resolveUserThinkingOpen(defaultOpen: boolean): boolean {
+	return allUserThinkingOpen ?? defaultOpen;
+}
+
+export function setAllUserThinkingOpen(open: boolean) {
+	allUserThinkingOpen = open;
+	for (const l of userThinkingListeners) l(open);
+}
+
+function subscribeUserThinking(fn: (open: boolean) => void): () => void {
+	userThinkingListeners.add(fn);
+	if (allUserThinkingOpen !== null) fn(allUserThinkingOpen); // late mounts honor the last set
+	return () => userThinkingListeners.delete(fn);
+}
 
 export function ThinkingBlock({
 	label = "YOUR THINKING",
 	text,
 	testId,
 	dataCommit,
+	mirror = false,
+	defaultOpen = false,
 }: {
 	label?: string;
 	text: string;
 	testId?: string;
 	/** The practice marker's register flag (commit vs nudge). */
 	dataCommit?: boolean;
+	/** Right-side placement (transcript rows): mirrored rail, right edge. */
+	mirror?: boolean;
+	/** Transcript rows arrive expanded (owner, 2026-10-07). */
+	defaultOpen?: boolean;
 }) {
-	const [open, setOpen] = useState(false); // arrives collapsed, always
+	const [open, setOpen] = useState(() => resolveUserThinkingOpen(defaultOpen));
+	// ⌘T: an explicit global set overrides every row (once set, rows re-sync).
+	const syncedRef = useRef(false);
+	useEffect(
+		() => subscribeUserThinking((o) => { syncedRef.current = true; setOpen(o); }),
+		[],
+	);
 	return (
 		/* The rail GROUPS and the rail IS THE MISSING CHARACTER (owner
 		   rounds, 2026-10-05): the heading sits INSIDE the rail, and the
@@ -44,7 +95,16 @@ export function ThinkingBlock({
 		<div
 			data-testid={testId}
 			data-commit={dataCommit === undefined ? undefined : dataCommit ? "true" : "false"}
-			className="lh-card-enter my-1 w-full border-l-2 border-muted-foreground/30 pl-[calc(3ch-2px)] font-ui text-xs"
+			data-side={mirror ? "right" : "left"}
+			className={cn(
+				// my-3 (owner, 2026-10-07): the row's own rhythm — 4px hugged the
+				// options on non-graded answered cards; 12px matches the card's
+				// mt-2/mt-3 spacing grammar.
+				"lh-card-enter my-3 font-ui text-xs",
+				mirror
+					? "ml-auto w-[85%] border-r-2 border-muted-foreground/30 pr-[calc(3ch-2px)]"
+					: "w-full border-l-2 border-muted-foreground/30 pl-[calc(3ch-2px)]",
+			)}
 		>
 			<button
 				type="button"

src/core/keyboard.ts

@@ -40,7 +40,8 @@ export type KeyAction =
 	| "question-prev-row"
 	| "question-pick-row"
 	| "question-submit"
-	| "open-settings";
+	| "open-settings"
+	| "toggle-user-thinking";
 
 /** Where the cheat sheet groups an action (display only — dispatch is
  *  global; a seam that isn't mounted simply no-ops). */
@@ -71,6 +72,7 @@ export const KEYBOARD_ACTIONS: readonly KeyActionDef[] = [
 	{ id: "jump-graph", label: "Graph view", scope: "global", binding: "mod+g" },
 	{ id: "new-session", label: "New session", scope: "global", binding: "mod+n" },
 	{ id: "rename-session", label: "Rename session", scope: "chat", binding: "f2" },
+	{ id: "toggle-user-thinking", label: "Toggle all your thinking", scope: "chat", binding: "mod+t" },
 	// ⌘F is surface-scoped (owner key map): the graph focuses node search; a
 	// chat-scoped transcript search rides the same event when it lands (the
 	// graph's listener simply isn't mounted on chat pages).

tests/keyboard-toggle-sidebar.test.ts

@@ -30,6 +30,12 @@ describe("kbdEventForAction — the one spelling for action events", () => {
 });
 
 describe("the ⌘B chain — keypress → binding → action → event", () => {
+	it("mod+t is the toggle-user-thinking action (owner round, 2026-10-07)", () => {
+		assert.equal(actionForBinding("mod+t"), "toggle-user-thinking");
+		assert.equal(bindingForAction("toggle-user-thinking"), "mod+t");
+		assert.equal(kbdEventForAction("toggle-user-thinking"), "lh:kbd-toggle-user-thinking");
+	});
+
 	it("mod+b is the toggle-sidebar action", () => {
 		assert.equal(actionForBinding("mod+b"), "toggle-sidebar");
 		assert.equal(bindingForAction("toggle-sidebar"), "mod+b");

tests/render-cards.test.tsx

@@ -241,7 +241,10 @@ describe("render smoke tests", () => {
 		const answer = buildAnswer(quizQD(), { values: ["Venus"] });
 		const html = renderToStaticMarkup(<AnsweredCard answer={answer} />);
 		assert.match(html, /incorrect/);
-		assert.match(html, /innermost/, "explanation renders post-answer");
+		// Tucked for ALL questions (owner, 2026-10-07): the explanation sits
+		// behind the Why toggle — never center stage.
+		assert.ok(html.includes("tucked-explanation"), "the Why toggle mounts");
+		assert.ok(!html.includes("innermost"), "explanation hidden until opened");
 		// Glyph-shaped SVG marks (owner preference) — pinned via data-mark.
 		assert.ok(html.includes('data-mark="check"') && html.includes('data-mark="x"'));
 	});
@@ -302,8 +305,8 @@ describe("render smoke tests", () => {
 		// The thinking sits ABOVE the verdict's explanation — the dialogue of
 		// thinking, not an afterthought.
 		assert.ok(
-			html.indexOf("your-thinking") < html.indexOf("innermost"),
-			"thinking before the explanation",
+			html.indexOf("your-thinking") < html.indexOf("tucked-explanation"),
+			"thinking before the explanation toggle",
 		);
 	});
 
@@ -574,11 +577,11 @@ describe("predict vs check rendering", () => {
 		assert.ok(html.includes("tucked-explanation"), "it sits behind the toggle");
 	});
 
-	it("a check answer keeps the inline explanation", () => {
+	it("a check answer tucks the explanation like every question (owner, 2026-10-07)", () => {
 		const answer = buildAnswer(quizQD(), { values: ["Venus"] });
 		const html = renderToStaticMarkup(<AnsweredCard answer={answer} />);
-		assert.ok(html.includes("Why:"), "checks explain inline (current behavior)");
-		assert.ok(!html.includes("tucked-explanation"));
+		assert.ok(html.includes("tucked-explanation"), "the prediction tuck is now universal");
+		assert.ok(!html.includes("Why:"), "no inline explanation — behind the toggle");
 	});
 
 	it("the reading-thinking channel is LIFTED above the card as its own user-side block", () => {

tests/render-md-blocks.test.tsx

@@ -14,6 +14,7 @@ import assert from "node:assert/strict";
 import { describe, it } from "node:test";
 import { renderToStaticMarkup } from "react-dom/server";
 import { MessageResponse } from "../components/ai-elements/message.tsx";
+import { ThinkingBlock, setAllUserThinkingOpen } from "@/components/thinking-block";
 import { MermaidOverlay, SessionMermaidContext, chartSize } from "../components/session-overlay.tsx";
 import { PlanPopup } from "../components/plan-block.tsx";
 import { MarkdownCode, codeSource } from "../components/md-blocks.tsx";
@@ -229,3 +230,43 @@ describe("parseAlertMarker (pure)", () => {
 		assert.equal(parseAlertMarker(em), null);
 	});
 });
+
+describe("md-blocks — the restored plain blockquote (owner round, 2026-10-07)", () => {
+	it("a plain quote carries Streamdown's own styling (the override displaced it)", () => {
+		const html = renderToStaticMarkup(
+			<MessageResponse mode="static">{"Before.\n\n> An ordinary quote.\n\nAfter."}</MessageResponse>,
+		);
+		assert.ok(html.includes("border-l-4"), "the left border is back");
+		assert.ok(html.includes("text-muted-foreground italic"), "muted italic — the quote register");
+		assert.ok(!html.includes("md-callout"), "a plain quote is not a callout box");
+	});
+});
+
+describe("ThinkingBlock — side-based authorship + ⌘T sync (owner round, 2026-10-07)", () => {
+	it("the default row stays left with the my-3 rhythm", () => {
+		const html = renderToStaticMarkup(<ThinkingBlock text="left side" />);
+		assert.ok(html.includes("border-l-2"), "left rail");
+		assert.ok(html.includes("my-3"), "the 12px rhythm (was my-1)");
+	});
+
+	it("mirrored rows hug the right edge, rail flipped, arriving open", () => {
+		const html = renderToStaticMarkup(<ThinkingBlock text="right side" mirror defaultOpen />);
+		assert.ok(html.includes('data-side="right"'));
+		assert.ok(html.includes("ml-auto"), "pushed to the right edge");
+		assert.ok(html.includes("border-r-2") && !html.includes("border-l-2"), "rail on the right");
+		assert.match(html, /aria-expanded="true"/);
+		assert.ok(html.includes("right side"), "text visible on arrival");
+	});
+
+	it("⌘T sets every row — explicit sets stomp individual state, late mounts honor the last set", () => {
+		setAllUserThinkingOpen(false);
+		const collapsed = renderToStaticMarkup(<ThinkingBlock text="synced" defaultOpen />);
+		assert.match(collapsed, /aria-expanded="false"/);
+		assert.ok(!collapsed.includes(">synced<"), "the open default was stomped");
+		setAllUserThinkingOpen(true);
+		const reopened = renderToStaticMarkup(<ThinkingBlock text="synced" />);
+		assert.match(reopened, /aria-expanded="true"/);
+		// restore the null default for other tests in this file
+		setAllUserThinkingOpen(true);
+	});
+});

tests/render-practice-surface.test.tsx

@@ -176,11 +176,15 @@ describe("the practice transcript cards", () => {
 		assert.doesNotMatch(html, /The solution/);
 	});
 
-	it("ThinkingCard: one label, collapsed arrival (legacy commit flags ignored)", () => {
+	it("ThinkingCard: one label, right side, expanded arrival (owner round, 2026-10-07)", () => {
 		const trace = renderToStaticMarkup(<ThinkingCard data={{ problemCallId: "c", commit: false, text: "stuck at step two" }} />);
 		assert.match(trace, /YOUR THINKING/);
-		assert.match(trace, /aria-expanded="false"/);
-		assert.ok(!trace.includes("stuck at step two"), "the text is one click away");
+		// Transcript rows arrive EXPANDED (clearly conveyed as sent) and
+		// MIRRORED right (side-based authorship).
+		assert.match(trace, /aria-expanded="true"/);
+		assert.ok(trace.includes("stuck at step two"), "the text is visible on arrival");
+		assert.ok(trace.includes('data-side="right"'), "mirrored to the right side");
+		assert.ok(trace.includes("border-r-2"), "the rail is on the right");
 		const legacy = renderToStaticMarkup(<ThinkingCard data={{ problemCallId: "c", commit: true, text: "It is 42." }} />);
 		assert.match(legacy, /YOUR THINKING/);
 		assert.doesNotMatch(legacy, /Your solution/);