feat: add full screen renderer

- implement renderer that clears and redraws all lines

- switch example to the library renderer

src/Example/Program.cs

@@ -9,7 +9,7 @@ using TinyTUI.Stdout;
 using var terminalInput = new ConsoleTerminalInput();
 var terminalOutput = new ConsoleTerminalOutput();
 var parser = new DefaultInputParser();
-var renderer = new DemoRenderer(terminalOutput);
+var renderer = new FullScreenRenderer(terminalOutput);
 using var runtime = new TuiRuntime(terminalInput, parser, renderer);
 
 var component = new EchoComponent(runtime);
@@ -46,6 +46,8 @@ file sealed class EchoComponent(ITuiRuntime runtime) : IInputComponent
         {
             "TinyTUI Runtime 示例",
             "====================",
+            $"当前渲染宽度: {width}",
+            string.Empty,
             "测试方式:",
             "- 输入普通字符 验证 Text 事件会进入焦点组件",
             "- 按方向键 Enter Backspace Tab Delete 验证 Key 事件会进入焦点组件",
@@ -94,31 +96,3 @@ file sealed class EchoComponent(ITuiRuntime runtime) : IInputComponent
         }));
     }
 }
-
-/// <summary>
-/// 用于手动验证 Runtime 的临时全量渲染器
-/// </summary>
-file sealed class DemoRenderer(ConsoleTerminalOutput output) : IRenderer
-{
-    /// <inheritdoc />
-    public void Render(IReadOnlyList<string> lines, TerminalSize size)
-    {
-        output.ClearScreen();
-        output.Write($"尺寸: {size.Columns} x {size.Rows}\r\n");
-        output.Write("\r\n");
-
-        foreach (var line in lines)
-        {
-            output.Write(line);
-            output.Write("\r\n");
-        }
-
-        output.Flush();
-    }
-
-    /// <inheritdoc />
-    public void Reset()
-    {
-        output.ClearScreen();
-    }
-}