fix: turn of autoComplete and fix rtey failed

src/app/coach-chat/page.tsx

@@ -390,9 +390,12 @@ function DirectCoachChatInner() {
                   onClick={() => {
                     // Retry last message
                     const lastUserMsg = messages.findLast(m => m.role === 'user');
-                    if (lastUserMsg && 'text' in lastUserMsg && typeof lastUserMsg.text === 'string') {
-                      clearError();
-                      sendMessage({ text: lastUserMsg.text });
+                    if (lastUserMsg && lastUserMsg.parts) {
+                      const textPart = lastUserMsg.parts.find(p => p.type === 'text');
+                      if (textPart && 'text' in textPart) {
+                        clearError();
+                        sendMessage({ text: textPart.text });
+                      }
                     }
                   }}
                   className="px-3 py-1.5 bg-red-600 text-white rounded-lg text-sm font-medium hover:bg-red-700 transition-colors"
@@ -424,6 +427,7 @@ function DirectCoachChatInner() {
               placeholder={`向 ${coach.name} 提問...`}
               className="flex-1 bg-transparent outline-none text-base text-gray-800 placeholder-gray-500"
               disabled={isLoading}
+              autoComplete="off"
             />
           </div>
           <button

src/app/conversation/[id]/page.tsx

@@ -748,12 +748,15 @@ export default function ConversationPage() {
                   onClick={() => {
                     // Retry last message
                     const lastUserMsg = messages.findLast(m => m.role === 'user');
-                    if (lastUserMsg && 'text' in lastUserMsg && typeof lastUserMsg.text === 'string') {
-                      clearError();
-                      sendMessage({
-                        text: lastUserMsg.text,
-                        metadata: lastUserMsg.metadata as Record<string, unknown> | undefined,
-                      });
+                    if (lastUserMsg && lastUserMsg.parts) {
+                      const textPart = lastUserMsg.parts.find(p => p.type === 'text');
+                      if (textPart && 'text' in textPart) {
+                        clearError();
+                        sendMessage({
+                          text: textPart.text,
+                          metadata: lastUserMsg.metadata as Record<string, unknown> | undefined,
+                        });
+                      }
                     }
                   }}
                   className="px-3 py-1.5 bg-red-600 text-white rounded-lg text-sm font-medium hover:bg-red-700 transition-colors"
@@ -829,6 +832,7 @@ export default function ConversationPage() {
               placeholder={speaker === 'student' ? `與 ${conversation.studentName} 對話...` : `詢問 ${conversation.coachName} 建議...`}
               className="flex-1 bg-transparent outline-none text-base text-gray-800 placeholder-gray-500"
               disabled={isLoading}
+              autoComplete="off"
             />
           </div>
           <button