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/server/api/routers/expenses.ts

@@ -58,11 +58,11 @@ export const expensesRouter = createTRPCRouter({
     .mutation(async ({ ctx, input }) => {
       const clean = {
         ...input,
-        clientId: input.clientId?.trim() || null,
-        businessId: input.businessId?.trim() || null,
-        invoiceId: input.invoiceId?.trim() || null,
-        category: input.category?.trim() || null,
-        notes: input.notes?.trim() || null,
+        clientId: input.clientId?.trim() ?? null,
+        businessId: input.businessId?.trim() ?? null,
+        invoiceId: input.invoiceId?.trim() ?? null,
+        category: input.category?.trim() ?? null,
+        notes: input.notes?.trim() ?? null,
       };
 
       if (clean.clientId) {
@@ -121,11 +121,11 @@ export const expensesRouter = createTRPCRouter({
 
       const clean = {
         ...data,
-        clientId: data.clientId?.trim() || null,
-        businessId: data.businessId?.trim() || null,
-        invoiceId: data.invoiceId?.trim() || null,
-        category: data.category?.trim() || null,
-        notes: data.notes?.trim() || null,
+        clientId: data.clientId?.trim() ?? null,
+        businessId: data.businessId?.trim() ?? null,
+        invoiceId: data.invoiceId?.trim() ?? null,
+        category: data.category?.trim() ?? null,
+        notes: data.notes?.trim() ?? null,
         updatedAt: new Date(),
       };