Add image-designer skill, align billing to DeepSeek ×1, and enrich Plaza demo.

Introduce AI image generation with chat shortcut and agent API, improve MindSpace chat-to-page save resolution, and seed Plaza covers with production deploy scripts.

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

src/hooks/useTKMindChat.ts

@@ -507,30 +507,43 @@ export function useTKMindChat(
         setChatState('loading');
         setError(null);
 
-        let sessionId = readStoredSessionId(userRef.current?.id);
-        let staleSession = false;
+        let sessionId: string | null = null;
         let freshSession: Session | null = null;
 
-        if (sessionId) {
-          try {
-            await getSession(sessionId);
-          } catch (err) {
-            if (err instanceof ApiError && (err.status === 403 || err.status === 404 || err.status === 400)) {
-              clearStoredSessionId(userRef.current?.id);
-              sessionId = null;
-              staleSession = true;
-            } else {
-              throw err;
-            }
-          }
+        setSessionsLoading(true);
+        try {
+          const items = sortAndTrim(await listSessions());
+          setSessions(items);
+          sessionId = items[0]?.id ?? null;
+        } catch {
+          // Fall back to stored session or create a new one when the list is unavailable.
+        } finally {
+          setSessionsLoading(false);
         }
 
         if (!sessionId) {
-          freshSession = await startSession();
-          sessionId = freshSession.id;
-          writeStoredSessionId(userRef.current?.id, sessionId);
-          if (staleSession) {
-            setNotice('上次会话已失效，已为你新建对话');
+          let staleSession = false;
+          sessionId = readStoredSessionId(userRef.current?.id);
+          if (sessionId) {
+            try {
+              await getSession(sessionId);
+            } catch (err) {
+              if (err instanceof ApiError && (err.status === 403 || err.status === 404 || err.status === 400)) {
+                clearStoredSessionId(userRef.current?.id);
+                sessionId = null;
+                staleSession = true;
+              } else {
+                throw err;
+              }
+            }
+          }
+
+          if (!sessionId) {
+            freshSession = await startSession();
+            sessionId = freshSession.id;
+            if (staleSession) {
+              setNotice('上次会话已失效，已为你新建对话');
+            }
           }
         }