.NET MAUI Hot Reload Diagnostics

Systematically diagnose Hot Reload failures for .NET MAUI apps.

Quick diagnosis checklist

1. Identify what's failing: XAML Hot Reload (.xaml changes) vs C# Hot Reload (.cs changes)
2. Check run configuration: Must be Debug config, started with F5/debugger attached
3. Save file and re-execute code path: C# changes require re-triggering the code
4. Check Hot Reload output: View > Output > "Hot Reload" (VS) or "C# Hot Reload" (VS Code)

⚠️ File encoding requirement

CRITICAL: All .cs files must be UTF-8 with BOM encoding.

# Check if file has BOM (should show "UTF-8 Unicode (with BOM)")
file -I *.cs