Build Blazor component for file system navigation with tree view.
Technical Implementation:
Use MudBlazor or Radzen for tree component
Implement IFileProvider for file access
Definition of Done:
✅ Tree view with expand/collapse
✅ Navigate folders
✅ Display file icons based on extension
✅ Context menu (rename, delete, new file)
✅ Search files functionality
✅ Shows file modification status