Fix OA workspace cover thumbnails and add space chat new session.

Resolve mindspace-cover images from workspace directories when generating feed thumbnails, refresh stale SVGs missing embedded photos, and disable thumbnail API caching so fixes take effect immediately. Also add a new session control to the space chat panel, including on mobile.

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

src/components/SpaceChatPanel.tsx

@@ -48,6 +48,16 @@ export function SpaceChatPanel({
     openRecharge,
     retryConnect,
   } = chat;
+  const busy = chatState === 'streaming' || chatState === 'loading' || chatState === 'connecting';
+  const memoryLoading = chatBridge ? false : mainChat.memoryLoading;
+
+  const handleNewSession = () => {
+    if (chatBridge) {
+      void chatBridge.newSession();
+      return;
+    }
+    void mainChat.newSession();
+  };
 
   useEffect(() => {
     if (!open) return;
@@ -75,6 +85,14 @@ export function SpaceChatPanel({
           </div>
         </div>
         <div className="space-chat-panel-actions">
+          <button
+            type="button"
+            className="ghost-btn space-chat-panel-new-session"
+            disabled={busy || memoryLoading}
+            onClick={handleNewSession}
+          >
+            新会话
+          </button>
           {!hideOpenFullChat ? (
             <button type="button" className="ghost-btn" onClick={onOpenFullChat}>
               打开完整聊天

src/hooks/usePageEditSubChat.ts

@@ -306,6 +306,12 @@ export function usePageEditSubChat({
     }
   }, [connectSubSession, start]);
 
+  const newSession = useCallback(async () => {
+    if (chatState === 'streaming' || chatState === 'loading' || chatState === 'connecting') return;
+    await close({ merge: false });
+    await start();
+  }, [chatState, close, start]);
+
   const startedRef = useRef(false);
 
   useEffect(() => {
@@ -335,6 +341,7 @@ export function usePageEditSubChat({
     dismissNotice,
     retryConnect,
     openRecharge: () => setNotice('余额不足，请充值后继续使用'),
+    newSession,
     close,
   };
 }

src/index.css

@@ -6045,7 +6045,7 @@ body,
     border-radius: 24px 24px 0 0;
   }
 
-  .space-chat-panel-actions .ghost-btn {
+  .space-chat-panel-actions .ghost-btn:not(.space-chat-panel-new-session) {
     display: none;
   }
 }