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/app/auth/reset-password/page.tsx

@@ -29,11 +29,12 @@ function ResetPasswordForm() {
   const [success, setSuccess] = useState(false);
   const [showPassword, setShowPassword] = useState(false);
   const [showConfirmPassword, setShowConfirmPassword] = useState(false);
-  const [tokenValid, setTokenValid] = useState<boolean | null>(null);
+  const [tokenValid, setTokenValid] = useState<boolean | null>(() =>
+    token ? null : false,
+  );
 
   useEffect(() => {
     if (!token) {
-      setTokenValid(false);
       return;
     }