feat: add daily report list preview

server/im_http.go

@@ -7168,6 +7168,7 @@ func dailyReportListPayload(report types.DailyReport) map[string]any {
 		"report_id":        report.ReportID,
 		"author_id":        report.AuthorID.UserId(),
 		"report_date":      report.ReportDate.Format("2006-01-02"),
+		"content_short":    monthlyReportPreview(report.Content),
 		"status":           report.Status,
 		"draft_updated_at": report.UpdatedAt.UTC().Format(time.RFC3339Nano),
 		"read_state":       report.ReadState,

server/im_http_test.go

@@ -2419,6 +2419,42 @@ func TestServeIMDailyReportStatisticsAndReminders(t *testing.T) {
 	}
 }
 
+func TestServeIMDailyReportsListIncludesContentPreview(t *testing.T) {
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+	expectIMBearer(t, ctrl, "token-1", 7, 42)
+	oldDailyReports := store.DailyReports
+	now := time.Now().UTC().Round(time.Millisecond)
+	reports := &testDailyReportsStore{report: &types.DailyReport{
+		ReportID:   "dr_test",
+		AuthorID:   42,
+		ReportDate: time.Date(2026, 8, 14, 0, 0, 0, 0, time.UTC),
+		Content:    strings.Repeat("日报", 80),
+		Status:     types.DailyReportStatusDraft,
+		ReadState:  "unread",
+		Version:    1,
+		CreatedAt:  now,
+		UpdatedAt:  now,
+	}}
+	store.DailyReports = reports
+	defer func() { store.DailyReports = oldDailyReports }()
+
+	req := httptest.NewRequest(http.MethodGet, "/v1/im/reports/daily?scope=mine", nil)
+	req.Header.Set("Authorization", "Bearer token-1")
+	rec := httptest.NewRecorder()
+	serveIMDailyReports(rec, req)
+
+	if rec.Code != http.StatusOK {
+		t.Fatalf("status: got %d, want %d; body=%s", rec.Code, http.StatusOK, rec.Body.String())
+	}
+	data := decodeIMHTTPResponse(t, rec).Data.(map[string]any)
+	items := data["items"].([]any)
+	item := items[0].(map[string]any)
+	if item["content_short"] != strings.Repeat("日报", 60)+"..." {
+		t.Fatalf("unexpected daily report preview: %#v", item["content_short"])
+	}
+}
+
 func TestServeIMMonthlyReportsCreate(t *testing.T) {
 	ctrl := gomock.NewController(t)
 	defer ctrl.Finish()