feat: search dropdown (#150)

- new search dropdown component that adds search / sort functionality to dropdowns
- replaces browser select component in select condition type dropdowns
- add font size prop to sort dropdown / search bar to scale size for dropdowns
- fix bad background color on tests page
- add scrollable class description / condition area for format / regex cards

CLAUDE.md

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+# Profilarr Development Guide
+
+## Commands
+- **Frontend**: `cd frontend && npm run dev` - Start React dev server
+- **Backend**: `cd backend && gunicorn -b 0.0.0.0:5000 app.main:app` - Run Flask server
+- **Docker**: `docker compose up` - Start both frontend/backend in dev mode
+- **Lint**: `cd frontend && npx eslint 'src/**/*.{js,jsx}'` - Check frontend code style
+- **Build**: `cd frontend && npm run build` - Build for production
+
+## Code Style
+### Frontend (React)
+- **Imports**: React first, third-party libs next, components, then utils
+- **Components**: Functional components with hooks, PascalCase naming
+- **Props**: PropTypes for validation, destructure props in component signature
+- **State**: Group related state, useCallback for memoized handlers
+- **JSX**: 4-space indentation, attributes on new lines for readability
+- **Error Handling**: try/catch for async operations, toast notifications
+
+### Backend (Python)
+- **Imports**: Standard lib first, third-party next, local modules last
+- **Naming**: snake_case for functions/vars/files, PascalCase for classes
+- **Functions**: Single responsibility, descriptive docstrings
+- **Error Handling**: Specific exception catches, return (success, message) tuples
+- **Indentation**: 4 spaces consistently
+- **Modularity**: Related functionality grouped in directories