统一单项目大屏与管理端全屏布局

需求：/display/{项目编码} 参照管理端项目大屏布局展示。

实现：抽取共享大屏组件，补充公开累计取号与最新号码字段，并完善桌面及窄屏适配。

验证：前端61项测试、TypeScript、Vite构建以及Go测试、vet、build均通过。

server/internal/httpapi/public.go

@@ -280,6 +280,8 @@ type displaySnapshotDTO struct {
 	WaitingCount       int64             `json:"waiting_count"`
 	WaitingTicketCount int64             `json:"waiting_ticket_count"`
 	WaitingPeopleCount int64             `json:"waiting_people_count"`
+	IssuedTicketCount  int               `json:"issued_ticket_count"`
+	LatestTicketNumber *string           `json:"latest_ticket_number"`
 	ExperiencedPeople  int64             `json:"experienced_people"`
 	CurrentBatch       *displayBatchDTO  `json:"current_batch"`
 	RecentBatches      []displayBatchDTO `json:"recent_batches"`
@@ -376,11 +378,22 @@ func (s *Server) displaySnapshot(w http.ResponseWriter, r *http.Request) {
 	if session.UpdatedAt.After(lastUpdated) {
 		lastUpdated = session.UpdatedAt
 	}
+	issuedTicketCount := max(0, session.NextTicketNumber-1)
+	var latestTicketNumber *string
+	if issuedTicketCount > 0 {
+		formatted, formatErr := domain.DisplayNumber("", issuedTicketCount)
+		if formatErr != nil {
+			writeError(w, formatErr)
+			return
+		}
+		latestTicketNumber = &formatted
+	}
 	writeJSON(w, http.StatusOK, displaySnapshotDTO{
 		ProjectName: project.Name, Status: project.Status,
 		Project:  displayProjectDTO{ID: project.ID, Name: project.Name, Status: project.Status},
 		Revision: session.Revision, WaitingCount: waiting.TicketCount,
 		WaitingTicketCount: waiting.TicketCount, WaitingPeopleCount: waiting.PeopleCount,
+		IssuedTicketCount: issuedTicketCount, LatestTicketNumber: latestTicketNumber,
 		ExperiencedPeople: experiencedPeople, CurrentBatch: batch, RecentBatches: recentBatches,
 		EstimatedWait: estimatedWait, ServerTime: s.now(), LastUpdatedAt: lastUpdated,
 	})

server/internal/httpapi/public_integration_test.go

@@ -283,4 +283,21 @@ func TestInternalPhoneLookupUsesLatestActiveSessionPerProject(t *testing.T) {
 			t.Fatalf("ticket = %#v, want current session revision %d", ticket, currentSession.Revision)
 		}
 	}
+
+	displayRecorder := httptest.NewRecorder()
+	displayRequest := httptest.NewRequest(http.MethodGet, "/api/display/"+strings.ToLower(project.Code)+"/snapshot", nil)
+	server.Handler().ServeHTTP(displayRecorder, displayRequest)
+	if displayRecorder.Code != http.StatusOK {
+		t.Fatalf("display status = %d, want 200; body = %s", displayRecorder.Code, displayRecorder.Body.String())
+	}
+	var displayResponse struct {
+		IssuedTicketCount  int     `json:"issued_ticket_count"`
+		LatestTicketNumber *string `json:"latest_ticket_number"`
+	}
+	if err := json.Unmarshal(displayRecorder.Body.Bytes(), &displayResponse); err != nil {
+		t.Fatal(err)
+	}
+	if displayResponse.IssuedTicketCount != 2 || displayResponse.LatestTicketNumber == nil || *displayResponse.LatestTicketNumber != "00002" {
+		t.Fatalf("display metrics = %#v, want issued 2 and latest 00002", displayResponse)
+	}
 }