fix: 右侧模型列表不可滚动 — 添加filler CSS和flex布局

- show_llms/show_llms_by_providers的HBox加css:filler
- 右侧urlwidget加css:filler
- show_llms_cards两个文件的VScrollPanel加css:filler
- CSS中为tabpanel-content和scrollpanel添加flex布局确保高度传递

wwwroot/model_plaza.css

@@ -69,6 +69,17 @@
 	padding: 4px 8px;
 }
 
+/* Right panel: ensure scrollable area fills available space */
+.plaza-tabs .tabpanel-content {
+	display: flex;
+	flex-direction: column;
+}
+.plaza-tabs .tabpanel-content > .scrollpanel {
+	flex: 1;
+	min-height: 0;
+	overflow-y: auto;
+}
+
 /* Model icon area */
 .plaza-card .model-icon-row {
 	gap: 8px;

wwwroot/show_llms.ui

@@ -2,6 +2,7 @@
 {
 	"widgettype":"HBox",
 	"options":{
+		"css":"filler",
 		"width":"100%",
 		"height":"100%"
 	},
@@ -65,6 +66,7 @@
 			"widgettype":"urlwidget",
 			"id":"plaza_cards_panel",
 			"options":{
+				"css":"filler",
 				"cwidth":82,
 				"height":"100%",
 				"url":"{{entire_url('show_llms_cards.ui')}}"

wwwroot/show_llms_by_providers.ui

@@ -2,6 +2,7 @@
 {
 	"widgettype":"HBox",
 	"options":{
+		"css":"filler",
 		"width":"100%",
 		"height":"100%"
 	},
@@ -65,6 +66,7 @@
 			"widgettype":"urlwidget",
 			"id":"plaza_provider_panel",
 			"options":{
+				"css":"filler",
 				"cwidth":82,
 				"height":"100%",
 				"url":"{{entire_url('show_llms_cards_by_provider.ui')}}"

wwwroot/show_llms_cards.ui

@@ -4,6 +4,7 @@
 {
 	"widgettype":"VScrollPanel",
 	"options":{
+		"css":"filler",
 		"width":"100%",
 		"height":"100%"
 	},

wwwroot/show_llms_cards_by_provider.ui

@@ -4,6 +4,7 @@
 {
 	"widgettype":"VScrollPanel",
 	"options":{
+		"css":"filler",
 		"width":"100%",
 		"height":"100%"
 	},