Refactor invoice data table and templates page for improved readability and functionality

- Cleaned up imports and formatted code for better readability in invoices-data-table.tsx.
- Enhanced invoice interface definitions for clarity.
- Improved toast messages for bulk delete and update actions.
- Refactored date formatting and status type retrieval for better readability.
- Simplified template management in templates page, extracting TemplateList component.
- Added registration toggle based on environment variable DISABLE_SIGNUPS.
- Updated navbar to conditionally render registration link based on allowRegistration prop.
- Enhanced error handling and validation in expenses and settings routers.
- Improved PDF export footer handling.
- Updated TRPC react integration for cleaner type imports.

src/app/auth/register/page.tsx

@@ -28,7 +28,8 @@ function RegisterForm() {
       method: "POST",
       headers: { "Content-Type": "application/json" },
       body: JSON.stringify({
-        name: `${firstName} ${lastName}`,
+        firstName,
+        lastName,
         email,
         password,
       }),