限制 AI 输入长度不超过 1000 字符，超出时提示用户

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

client/src/pages/AIPage.tsx

@@ -202,6 +202,8 @@ function makeId() {
   return `${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
 }
 
+const MAX_INPUT_LENGTH = 1000;
+
 export type AIPageVariant = "page" | "split";
 
 export interface AIPageProps {
@@ -422,6 +424,10 @@ export default function AIPage({ variant = "page", onClose }: AIPageProps = {})
     (question: string) => {
       const trimmed = question.trim();
       if (!trimmed || sending) return;
+      if (trimmed.length > MAX_INPUT_LENGTH) {
+        toast.error(formatText(aiText.inputTooLong, { max: MAX_INPUT_LENGTH }));
+        return;
+      }
       if (!mac || !deviceState || !api) {
         toast.error(aiText.deviceRequired);
         return;
@@ -595,12 +601,27 @@ export default function AIPage({ variant = "page", onClose }: AIPageProps = {})
     [input, send],
   );
 
-  const onInputChange = useCallback((e: React.ChangeEvent<HTMLTextAreaElement>) => {
-    setInput(e.target.value);
-    const el = e.target;
-    el.style.height = "auto";
-    el.style.height = `${Math.min(el.scrollHeight, 160)}px`;
-  }, []);
+  const overLimitToastShown = useRef(false);
+
+  const onInputChange = useCallback(
+    (e: React.ChangeEvent<HTMLTextAreaElement>) => {
+      const raw = e.target.value;
+      if (raw.length > MAX_INPUT_LENGTH) {
+        if (!overLimitToastShown.current) {
+          toast.error(formatText(aiText.inputTooLong, { max: MAX_INPUT_LENGTH }));
+          overLimitToastShown.current = true;
+        }
+        setInput(raw.slice(0, MAX_INPUT_LENGTH));
+      } else {
+        overLimitToastShown.current = false;
+        setInput(raw);
+      }
+      const el = e.target;
+      el.style.height = "auto";
+      el.style.height = `${Math.min(el.scrollHeight, 160)}px`;
+    },
+    [aiText],
+  );
 
   // ── 优化记录：对比对话框 & 应用/回滚 ──
   const [compareMsg, setCompareMsg] = useState<OptimizeUIMessage | null>(null);
@@ -880,6 +901,7 @@ export default function AIPage({ variant = "page", onClose }: AIPageProps = {})
             onChange={onInputChange}
             onKeyDown={onKeyDown}
             rows={1}
+            maxLength={MAX_INPUT_LENGTH}
             placeholder={aiText.inputPlaceholder}
             className="flex-1 bg-transparent outline-none resize-none text-[15px] text-white placeholder:text-white/35 py-1.5 px-1 max-h-40 leading-[1.4]"
           />