Adds a new example showing interactive file system navigation with dynamic component updates and file I/O integration.

Implementation

• FileExplorer.razor: Interactive component with directory/file navigation using SpectreTable, clickable TextButton entries, and dynamic file details panel
• File system integration: Uses System.IO APIs (Directory.GetDirectories/GetFiles, FileInfo) with graceful error handling for permission issues
• Dynamic rendering: File selection toggles details panel, directory navigation refreshes table contents

Key Features

<SpectreTable>
  <!-- Directories and files as interactive buttons -->
  <TextButton Content="📁 src" OnClick="@(() => NavigateToDirectory(...))" />
  <TextButton Content="📄 README.md" OnClick="@(() => SelectFile(...))" />
</SpectreTable>

@if (!string.IsNullOrEmpty(_selectedFile))
{
  <Panel Title="File Details">
    <!-- Size, modified date, extension -->
  </Panel>
}

Demonstrates table component usage, file I/O patterns, and state-driven UI updates without unnecessary StateHasChanged() calls (event handlers trigger re-renders automatically).

• Fixes Example - Local File Explorer #94

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.