调整：叫号内容连续播报三次

需求：公屏每次播放叫号声音时重复三遍。
实现：单项目页和多项目公屏均为每个新批次排队三条相同语音，并更新回归测试。

web/src/pages/DisplayPage.test.tsx

@@ -89,7 +89,7 @@ describe("DisplayPage", () => {
     ]);
   });
 
-  it("新批次出现时只播报一次叫号内容", () => {
+  it("新批次出现时连续播报三次叫号内容", () => {
     const speak = vi.fn();
     const cancel = vi.fn();
     class SpeechSynthesisUtteranceMock {
@@ -118,11 +118,13 @@ describe("DisplayPage", () => {
     rerender(<DisplayPage />);
 
     expect(cancel).toHaveBeenCalledOnce();
-    expect(speak).toHaveBeenCalledOnce();
-    expect(speak.mock.calls[0][0]).toMatchObject({
+    expect(speak).toHaveBeenCalledTimes(3);
+    for (const [utterance] of speak.mock.calls) {
+      expect(utterance).toMatchObject({
         text: "请零零零零五号至零零零零六号，前往入口。",
         lang: "zh-CN",
         rate: 0.9,
       });
+    }
   });
 });

web/src/pages/DisplayPage.tsx

@@ -68,11 +68,13 @@ export function DisplayPage() {
       || typeof SpeechSynthesisUtterance === "undefined"
     ) return;
 
+    window.speechSynthesis.cancel();
+    for (let repeat = 0; repeat < 3; repeat += 1) {
       const utterance = new SpeechSynthesisUtterance(currentAnnouncement);
       utterance.lang = "zh-CN";
       utterance.rate = 0.9;
-    window.speechSynthesis.cancel();
       window.speechSynthesis.speak(utterance);
+    }
   }, [currentAnnouncement, currentCallKey, hasSnapshot, token]);
   const waitingTicketCount = data?.waiting_ticket_count ?? data?.waiting_count ?? 0;
   const waitingPeopleCount = data?.waiting_people_count ?? 0;

web/src/pages/PublicDisplayCenterPage.test.tsx

@@ -62,7 +62,7 @@ describe("PublicDisplayCenterPage", () => {
     expect(screen.queryByRole("navigation", { name: "管理任务" })).not.toBeInTheDocument();
   });
 
-  it("新叫号批次出现时播报项目和号码", () => {
+  it("新叫号批次出现时连续三次播报项目和号码", () => {
     const speak = vi.fn();
     class SpeechSynthesisUtteranceMock {
       text: string;
@@ -95,10 +95,12 @@ describe("PublicDisplayCenterPage", () => {
     };
     rerender(<PublicDisplayCenterPage />);
 
-    expect(speak).toHaveBeenCalledOnce();
-    expect(speak.mock.calls[0][0]).toMatchObject({
+    expect(speak).toHaveBeenCalledTimes(3);
+    for (const [utterance] of speak.mock.calls) {
+      expect(utterance).toMatchObject({
         text: "东门观光车，请零零零一六号，前往入口。",
         lang: "zh-CN",
       });
+    }
   });
 });

web/src/pages/PublicDisplayCenterPage.tsx

@@ -37,11 +37,13 @@ export function PublicDisplayCenterPage() {
 
     window.speechSynthesis.cancel();
     for (const announcement of announcements) {
+      for (let repeat = 0; repeat < 3; repeat += 1) {
         const utterance = new SpeechSynthesisUtterance(announcement);
         utterance.lang = "zh-CN";
         utterance.rate = 0.9;
         window.speechSynthesis.speak(utterance);
       }
+    }
   }, [data]);
 
   return (