feat: upgrade select list items

- add SelectItem model with labels and descriptions

- support filtering, wrap-around, scroll info, and selection change

- demonstrate select list filtering in Example

src/Example/Program.cs

@@ -54,10 +54,11 @@ input.OnSubmitted = value =>
                 new SelectOverlay(runtime, message => AddEvent(eventsText, message), textMeasurer),
                 new OverlayOptions
                 {
-                    Width = 34,
+                    Width = OverlaySize.Percent(62),
+                    MinWidth = 56,
                     Anchor = OverlayAnchor.LeftCenter,
                     Margin = new OverlayMargin(1),
-                    MaxHeight = 9,
+                    MaxHeight = 12,
                 });
             break;
         case "/edit":
@@ -229,15 +230,42 @@ file sealed class SelectOverlay : IInputComponent
     {
         _runtime = runtime;
         _addEvent = addEvent;
-        _selectList = new SelectList(textMeasurer) { Height = 5 };
-        _selectList.SetItems(["Text", "Input", "Editor", "SelectList", "Markdown", "Loader", "Overlay"]);
-        _selectList.OnSubmitted = (item, _) =>
+        _selectList = new SelectList(textMeasurer)
         {
-            _addEvent($"Selected: {item}");
+            Height = 6,
+            EmptyText = "没有匹配项",
+        };
+        _selectList.SetItems(
+        [
+            new SelectItem("text", "Text", "渲染纯文本和多行内容"),
+            new SelectItem("input", "Input", "单行输入 提交 取消和光标定位"),
+            new SelectItem("editor", "Editor", "多行编辑 历史记录 词级移动和撤销"),
+            new SelectItem("select-list", "SelectList", "过滤 描述列 循环选择和提交"),
+            new SelectItem("markdown", "Markdown", "轻量 Markdown 文本展示"),
+            new SelectItem("loader", "Loader", "自动 tick 的加载动画"),
+            new SelectItem("overlay", "Overlay", "定位 尺寸 焦点和 non-capturing 提示"),
+        ]);
+        _selectList.OnSelectionChanged = (item, _) => _addEvent($"Selection: {item.Label}");
+        _selectList.OnItemSubmitted = (item, _) =>
+        {
+            _addEvent($"Selected: {item.Label} ({item.Value})");
             _runtime.HideOverlay();
         };
         _selectList.OnCanceled = _runtime.HideOverlay;
-        _box = new Box(_selectList, textMeasurer) { Title = "SelectList" };
+        _box = new Box(
+            new Container
+            {
+                Children =
+                {
+                    new Text("输入文本过滤 Backspace 删除过滤 Up/Down 循环选择 Enter 提交"),
+                    new Text(),
+                    _selectList,
+                },
+            },
+            textMeasurer)
+        {
+            Title = "SelectList",
+        };
     }
 
     public IReadOnlyList<string> Render(int width) => _box.Render(width);