feat: add administration page and account role management

- Implemented `AdministrationContent` component for managing account roles.
- Created `AdministrationPage` to serve as the main entry point for administration tasks.
- Added PDF preview functionality with `PdfPreviewFrame` component for invoice generation.
- Introduced `InputColor` component for advanced color selection with various formats.
- Established color conversion utilities in `color-converter.ts` for handling color formats.
- Defined appearance-related schemas and types in `appearance.ts` for consistent theme management.

src/hooks/useCountUp.ts

@@ -39,6 +39,7 @@ export function useCountUp({
 
   useEffect(() => {
     // Reset when end value changes
+    // eslint-disable-next-line react-hooks/set-state-in-effect -- Restart the animation from the configured start value when inputs change.
     setCount(start);
     setIsAnimating(false);