fix(desktop): Tauri 端找碴验证 7 项修复 — 消息泄漏/UUID暴露/错误友好化

B15/B11: streamStore onAgentStream 添加 activeRunId 过滤，移除降级匹配，
hand/workflow 消息追加前验证 runId 归属；chatStore 切换/新建对话时
先 cancelStream 终止旧流；ChatArea hand-execution-complete 事件
添加 isStreaming 守卫

B4/B5: ChatArea 模型列表过滤 embedding 模型，provider 设为 undefined
隐藏 UUID

B2/B3: streamStore onError 添加 formatUserError 函数，将原始 JSON
错误转换为中文友好提示

B1: SuggestionChips onSelect 延迟调用 handleSend 自动发送建议

fix(runtime): test_util.rs with_error 添加 mut self，with_stream_chunks
移除多余 mut

fix(saas): lib.rs 添加 Result/SaasError re-export

desktop/src/components/ChatArea.tsx

@@ -88,12 +88,17 @@ export function ChatArea({ compact, onOpenDetail }: { compact?: boolean; onOpenD
   const models = useMemo(() => {
     const failed = failedModelIds.current;
     if (isLoggedIn && saasModels.length > 0) {
-      return saasModels.map(m => ({
-        id: m.alias || m.id,
-        name: m.alias || m.id,
-        provider: m.provider_id,
-        available: !failed.has(m.alias || m.id),
-      }));
+      return saasModels
+        .filter(m => {
+          const name = (m.alias || m.id).toLowerCase();
+          return !name.includes('embedding');
+        })
+        .map(m => ({
+          id: m.alias || m.id,
+          name: m.alias || m.id,
+          provider: undefined,
+          available: !failed.has(m.alias || m.id),
+        }));
     }
     if (configModels.length > 0) {
       return configModels;
@@ -210,6 +215,8 @@ export function ChatArea({ compact, onOpenDetail }: { compact?: boolean; onOpenD
       'hand-execution-complete',
       (event) => {
         const { handId, success, error } = event.payload;
+        const streaming = useChatStore.getState().isStreaming;
+        if (!streaming) return;
         useChatStore.getState().addMessage({
           id: crypto.randomUUID(),
           role: 'hand',
@@ -502,7 +509,7 @@ export function ChatArea({ compact, onOpenDetail }: { compact?: boolean; onOpenD
           {!isStreaming && suggestions.length > 0 && !messages.some(m => m.error) && (
             <SuggestionChips
               suggestions={suggestions}
-              onSelect={(text) => { setInput(text); textareaRef.current?.focus(); }}
+              onSelect={(text) => { setInput(text); textareaRef.current?.focus(); setTimeout(() => handleSend(), 0); }}
               className="mb-3"
             />
           )}