fix: billing query - use Tabular instead of DataViewer, fix form submit target

- Changed DataViewer to Tabular with row_options.fields for proper table rendering
- Form submit target changed from 'self' to 'billing_page' (root VBox ID)
  with mode:replace, preventing nested page loading inside Form
- Fixed page_size to page_rows (correct parameter name)
- Added column definitions: date, time, subject, direction, summary, amount, balance

wwwroot/billing.ui

@@ -2,10 +2,11 @@
 {% set end_date = params_kw.get('end_date', '') %}
 {
 	"widgettype":"VBox",
+	"id":"billing_page",
 	"options":{
 		"width":"100%",
+		"height":"100%",
 		"css":"card",
-		"cwidth":30,
 		"gap":"8px"
 	},
 	"subwidgets":[
@@ -45,24 +46,105 @@
 					"wid":"self",
 					"event":"submit",
 					"actiontype":"urlwidget",
-					"target":"self",
+					"target":"billing_page",
 					"options":{
 						"url":"{{entire_url('/accounting/billing.ui')}}"
-					}
+					},
+					"mode":"replace"
 				}
 			]
 		}
 {% if start_date and end_date %}
 		,{
-			"widgettype":"DataViewer",
+			"widgettype":"Tabular",
 			"options":{
+				"width":"100%",
+				"height":"100%",
 				"data_url":"{{entire_url('/accounting/billing.dspy')}}",
 				"data_params":{
 					"start_date":"{{start_date}}",
 					"end_date":"{{end_date}}"
 				},
 				"editable":false,
-				"page_size":30
+				"page_rows":80,
+				"cache_limit":3,
+				"row_options":{
+					"browserfields":{
+						"exclouded":["row_num_"]
+					},
+					"fields":[
+						{
+							"name":"acc_date",
+							"title":"日期",
+							"type":"date",
+							"uitype":"date",
+							"datatype":"date",
+							"label":"日期",
+							"cwidth":12
+						},
+						{
+							"name":"acc_timestamp",
+							"title":"时间",
+							"type":"timestamp",
+							"uitype":"timestamp",
+							"datatype":"timestamp",
+							"label":"时间",
+							"cwidth":16
+						},
+						{
+							"name":"subject_name",
+							"title":"科目",
+							"type":"str",
+							"length":50,
+							"uitype":"str",
+							"datatype":"str",
+							"label":"科目",
+							"cwidth":14
+						},
+						{
+							"name":"acc_dir",
+							"title":"方向",
+							"type":"str",
+							"length":4,
+							"uitype":"str",
+							"datatype":"str",
+							"label":"方向",
+							"cwidth":8
+						},
+						{
+							"name":"summary",
+							"title":"摘要",
+							"type":"str",
+							"length":100,
+							"uitype":"str",
+							"datatype":"str",
+							"label":"摘要",
+							"cwidth":30
+						},
+						{
+							"name":"amount",
+							"title":"金额",
+							"type":"float",
+							"length":18,
+							"dec":4,
+							"uitype":"float",
+							"datatype":"float",
+							"label":"金额",
+							"cwidth":12
+						},
+						{
+							"name":"balance",
+							"title":"余额",
+							"type":"float",
+							"length":18,
+							"dec":4,
+							"uitype":"float",
+							"datatype":"float",
+							"label":"余额",
+							"cwidth":12
+						}
+					]
+				}
 			}
 		}
 {% endif %}