Add MindSpace visual page editor and Plaza local Tunnel deployment.

In-preview HTML editing with undo/redo sync replaces Agent patch auto-save; Plaza runs on local Mac via Cloudflare Tunnel with embed height and CSP fixes.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/hooks/usePageDraftHistory.ts

@@ -67,28 +67,28 @@ export function usePageDraftHistory(initial: PageDraftSnapshot) {
     [flushDebounced, snapshot],
   );
 
-  const undo = useCallback(() => {
+  const undo = useCallback((): PageDraftSnapshot | null => {
     flushDebounced();
     const previous = pastRef.current[pastRef.current.length - 1];
-    if (!previous) return false;
+    if (!previous) return null;
     pastRef.current = pastRef.current.slice(0, -1);
     futureRef.current = [snapshot, ...futureRef.current];
     stableRef.current = previous;
     setSnapshot(previous);
     bump();
-    return true;
+    return previous;
   }, [flushDebounced, snapshot]);
 
-  const redo = useCallback(() => {
+  const redo = useCallback((): PageDraftSnapshot | null => {
     flushDebounced();
     const next = futureRef.current[0];
-    if (!next) return false;
+    if (!next) return null;
     futureRef.current = futureRef.current.slice(1);
     pastRef.current = [...pastRef.current, snapshot];
     stableRef.current = next;
     setSnapshot(next);
     bump();
-    return true;
+    return next;
   }, [flushDebounced, snapshot]);
 
   const reset = useCallback(

src/hooks/usePageEditSubChat.ts

@@ -19,7 +19,6 @@ import {
   getToolConfirmation,
   pushMessage,
 } from '../utils/message';
-import { extractMindSpacePagePatch, type MindSpacePagePatch } from '../utils/mindspacePagePatch';
 
 function buildPageEditSummary(messages: Message[], pageTitle: string): string {
   const lines = messages
@@ -45,7 +44,6 @@ export function usePageEditSubChat({
   user,
   enabled,
   onSessionChange,
-  onPagePatch,
   onForkUnavailable,
 }: {
   pageId: string;
@@ -55,7 +53,6 @@ export function usePageEditSubChat({
   user?: PortalUser | null;
   enabled: boolean;
   onSessionChange?: (sessionId: string | null) => void;
-  onPagePatch?: (patch: MindSpacePagePatch) => void;
   onForkUnavailable?: () => void;
 }) {
   const [session, setSession] = useState<Session | null>(null);
@@ -69,7 +66,6 @@ export function usePageEditSubChat({
   const unsubscribeRef = useRef<(() => void) | null>(null);
   const messagesRef = useRef<Message[]>([]);
   const sessionRef = useRef<Session | null>(null);
-  const appliedPatchKeysRef = useRef(new Set<string>());
   const closingRef = useRef(false);
 
   useEffect(() => {
@@ -230,7 +226,6 @@ export function usePageEditSubChat({
         setChatState('idle');
         setPendingTool(null);
         activeRequestId.current = null;
-        appliedPatchKeysRef.current.clear();
         closingRef.current = false;
       }
     },
@@ -327,22 +322,6 @@ export function usePageEditSubChat({
     };
   }, [close, enabled, pageId, parentSessionId, start]);
 
-  useEffect(() => {
-    if (!onPagePatch) return;
-    if (chatState !== 'idle') return;
-    for (let i = messages.length - 1; i >= 0; i -= 1) {
-      const message = messages[i];
-      if (message.role !== 'assistant') continue;
-      const patch = extractMindSpacePagePatch(getDisplayText(message));
-      if (!patch) continue;
-      const key = `${message.id ?? i}:${JSON.stringify(patch)}`;
-      if (appliedPatchKeysRef.current.has(key)) return;
-      appliedPatchKeysRef.current.add(key);
-      onPagePatch(patch);
-      return;
-    }
-  }, [chatState, messages, onPagePatch]);
-
   return {
     session,
     messages,