Phase 2-3: UI layout, theme switching, CRUD tools, process execution
- Phase 2: MainWindow 3-section layout (sidebar/content/log bar), Dark/Light theme with ThemeHelper, MainViewModel with ObservableProperty/RelayCommand, tool card filtering by search + category
- Phase 3: ToolEditWindow for add/edit tools, ProcessExecutionService (Process.Start + error handling), double-click + right-click context menu (run/edit), path browse dialog
- Bugfix: ContextMenu commands now use PlacementTarget.Tag binding (ContextMenu in separate visual tree)
- Bugfix: StaticResource converters moved to XAML before DataTemplate to fix XamlParseException on tool card render
- Bugfix: Pure filenames (no path separators) treated as PATH commands, not marked invalid
- Bugfix: RefreshData preserves SelectedCategory; Load() catches all exceptions; Save() wrapped in try-catch; auto-scroll log to newest entry
- Tests: xUnit project with 55 tests covering models, services, converters, and view models
home-PC
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