feat(asr): 前端预热传标题（REQ-266 接线）

Author: Aparencia

app/src/components/ProfileDetector.test.tsx

@@ -76,7 +76,11 @@ describe("ProfileDetector v0.13.6 三维交互", () => {
     await waitFor(() => expect(screen.getByRole("button", { name: "投资理财" })).toBeTruthy());
     fireEvent.click(screen.getByRole("button", { name: "会计财务" }));
     await waitFor(() =>
-      expect(invokeMock).toHaveBeenCalledWith("preheat_domain_hotwords", { kind: "economy", fine: ["invest", "accounting"] }),
+      expect(invokeMock).toHaveBeenCalledWith("preheat_domain_hotwords", {
+        kind: "economy",
+        fine: ["invest", "accounting"],
+        title: "某视频_哔哩哔哩_bilibili",
+      }),
     );
     await waitFor(() =>
       expect(invokeMock).toHaveBeenCalledWith("remember_video_profile_domain", {

app/src/components/ProfileDetector.tsx

@@ -207,7 +207,8 @@ export default function ProfileDetector({
       // 审查 L2 修复：preheat 与 remember 相互独立（热词失败不阻断记忆写）
       let warmErr = "";
       try {
-        await invoke("preheat_domain_hotwords", { kind: d.kind, fine: fineIds });
+        // REQ-266（v0.20.1）：标题主题词随预热注入（后端 title_hotword_candidates 提取）
+        await invoke("preheat_domain_hotwords", { kind: d.kind, fine: fineIds, title: windowTitle });
       } catch (e) {
         warmErr = `领域热词预热失败: ${e}`;
       }