删除 Direct 输入区发送按钮里不可达的忙态分支

- apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectComposer/DirectProjectComposer.tsx 发送按钮只在非 busy 分支渲染，去掉 '思考中' 文案、Loader2 转圈与 disabled 里的 busy 条件，并移除不再使用的 Loader2 import
- busy 时仍由既有 ComposerStopButton 承担停止入口，渲染结果不变

apps/ai-game-creator-shell/src/view/project-development/chat/components/DirectProjectComposer/DirectProjectComposer.tsx

@@ -1,4 +1,4 @@
-import { ArrowUp, AtSign, Loader2 } from 'lucide-react';
+import { ArrowUp, AtSign } from 'lucide-react';
 import type { FormEventHandler } from 'react';
 import { useRef, useState } from 'react';
 
@@ -78,20 +78,16 @@ export function DirectProjectComposer({
   const [voiceNotice, setVoiceNotice] = useState('');
   const [modelReady, setModelReady] = useState(false);
   const [modelValidating, setModelValidating] = useState(false);
-  const submitLabel = busy ? '思考中' : '发送';
+  // 这个按钮只在非 busy 分支出现（busy 时由 ComposerStopButton 接管），所以不再带忙态逻辑。
   const submitButton = (
     <button
       type="submit"
       className="project-chat-submit-button"
-      aria-label={submitLabel}
-      title={submitLabel}
-      disabled={busy || !modelReady || modelValidating}
+      aria-label="发送"
+      title="发送"
+      disabled={!modelReady || modelValidating}
     >
-      {busy ? (
-        <Loader2 size={16} aria-hidden="true" className="animate-spin" />
-      ) : (
-        <ArrowUp size={16} aria-hidden="true" />
-      )}
+      <ArrowUp size={16} aria-hidden="true" />
     </button>
   );