feat(chat): answer the CLI's menus from the chat; Stop ends Thinking… (#74)

- A menu the CLI asks with (AskUserQuestion — one question or several,
  multiSelect —, a permission or trust prompt, Codex's approval, a
  first-start login menu) is read off the terminal under the chat
  (`parsePaneMenu`/`readRunMenu`) and shown in the prompt box's place as a
  card of buttons. A pick presses its digit (picks it, or ticks its box),
  Claude's unnumbered Submit row is reached with the arrows and Enter, and
  Cancel presses Esc. "Type something" opens a field in the card: its text
  goes in by the arrows, Ctrl+U over anything already typed there, a
  bracketed paste and Enter. That row presses no key — a second press of
  its digit typed the digit into the CLI's field ("44444…"). Keys verified
  on Claude Code 2.1.296 and Codex 0.161. AskUserQuestion fires no
  Notification, so a menu on screen also counts as waiting (live line, tab
  badge). Client only: no new route.
- #74: Esc before the model wrote anything puts the prompt back in Claude
  Code's input box and writes no "[Request interrupted by user]" line, so
  the transcript ended on the prompt and the chat read "Thinking…" for
  15 min. The chat's Stop now ends the live line until a newer transcript
  line arrives (matched by line, not by clock).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

client/src/components/conversation/MessageList.tsx

@@ -156,6 +156,9 @@ interface MessageListProps {
   waiting?: boolean;
   /** Shows the pane's terminal, where that question is answered. */
   onOpenTerminal?: () => void;
+  /** Bumped by the chat's Stop: the turn on screen is over, even when the
+   *  transcript never says so. */
+  stopped?: number;
 }
 
 /** Build a map from tool_use id → tool_result for matching */
@@ -611,15 +614,24 @@ export function MessageList({
   live = false,
   waiting = false,
   onOpenTerminal,
+  stopped = 0,
 }: MessageListProps) {
   const { t } = useTranslation("sessions");
   const toolResultMap = useMemo(() => buildToolResultMap(messages), [messages]);
+  const keys = useMemo(() => messageKeys(messages), [messages]);
+  const lastKey = keys[keys.length - 1] ?? null;
+  // The newest line when Stop was pressed. Esc before the model wrote anything
+  // puts the prompt back in Claude Code's input box and writes no
+  // "[Request interrupted…]" line (issue #74), so the transcript still ends on
+  // the prompt: no live line until a newer one arrives.
+  const [stop, setStop] = useState<{ n: number; on: string | null }>({ n: stopped, on: null });
+  if (stop.n !== stopped) setStop({ n: stopped, on: lastKey });
+  const halted = stop.on !== null && stop.on === lastKey;
   const pending = useMemo(
-    () => (live ? workingOn(messages, toolResultMap) : null),
-    [live, messages, toolResultMap]
+    () => (live && !halted ? workingOn(messages, toolResultMap) : null),
+    [live, halted, messages, toolResultMap]
   );
   const stats = useMemo(() => (pending ? turnStats(messages) : null), [pending, messages]);
-  const keys = useMemo(() => messageKeys(messages), [messages]);
   const items = useMemo(() => chatItems(messages, keys), [messages, keys]);
 
   if (loading) {