feat(reports): align rollup timezones

internal/handler/api/v1/account_handler.go

@@ -456,6 +456,7 @@ func serializeAccountSettings(account *model.Account) map[string]any {
 		"auto_resolve_ignore_waiting": false,
 		"audio_transcriptions":        false,
 		"auto_resolve_label":          "",
+		"reporting_timezone":          account.ReportingTimezone,
 	}
 	return settings
 }

internal/handler/api/v1/analytics_handler_test.go

@@ -51,7 +51,7 @@ func (s *AnalyticsHandlerTestSuite) SetupSuite() {
 	))
 
 	// Create test account
-	acct := model.Account{Name: "TestAccount"}
+	acct := model.Account{Name: "TestAccount", ReportingTimezone: "UTC"}
 	s.Require().NoError(db.Create(&acct).Error)
 	s.accountID = acct.ID