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/proxy.ts

@@ -4,6 +4,12 @@ import type { NextRequest } from "next/server";
 export function proxy(request: NextRequest) {
   const { pathname } = request.nextUrl;
 
+  if (pathname === "/auth/register" && process.env.DISABLE_SIGNUPS === "true") {
+    const signInUrl = new URL("/auth/signin", request.url);
+    signInUrl.searchParams.set("signup", "disabled");
+    return NextResponse.redirect(signInUrl);
+  }
+
   // Define public routes that don't require authentication
   const publicRoutes = ["/", "/auth/signin", "/auth/register"];