refactor: remove InvoiceView component and update related email and invoice handling

- Deleted the InvoiceView component to streamline the codebase.
- Updated EmailPreview and SendEmailDialog components to include currency and notes fields.
- Enhanced invoice-form to handle default hourly rates and improved item mapping.
- Refactored email template generation to include notes and currency formatting.
- Adjusted API routers for invoices to calculate totals and handle notes and currency correctly.

src/lib/email-templates/invoice-email.ts

@@ -6,6 +6,7 @@ interface InvoiceEmailTemplateProps {
     status: string;
     totalAmount: number;
     taxRate: number;
+    currency?: string | null;
     notes?: string | null;
     client: {
       name: string;
@@ -57,10 +58,22 @@ export function generateInvoiceEmailTemplate({
   const formatCurrency = (amount: number) => {
     return new Intl.NumberFormat("en-US", {
       style: "currency",
-      currency: "USD",
+      currency: invoice.currency ?? "USD",
     }).format(amount);
   };
 
+  const escapeHtml = (value: string) =>
+    value
+      .replace(/&/g, "&")
+      .replace(/</g, "&lt;")
+      .replace(/>/g, "&gt;")
+      .replace(/"/g, "&quot;")
+      .replace(/'/g, "&#39;");
+
+  const formattedNotes = invoice.notes?.trim()
+    ? escapeHtml(invoice.notes).replace(/\n/g, "<br>")
+    : "";
+
   const getTimeOfDayGreeting = () => {
     const hour = new Date().getHours();
     if (hour < 12) return "Good morning";
@@ -459,7 +472,16 @@ export function generateInvoiceEmailTemplate({
                 </div>
             </div>
 
-
+            ${
+              formattedNotes
+                ? `<div class="invoice-card">
+                <div class="invoice-summary">
+                    <div class="invoice-number" style="font-size: 18px;">Notes</div>
+                </div>
+                <div class="message" style="margin-bottom: 0;">${formattedNotes}</div>
+            </div>`
+                : ""
+            }
 
             <div class="attachment-notice">
                 <div class="attachment-icon"></div>
@@ -540,7 +562,15 @@ Subtotal: ${formatCurrency(subtotal)}${
   }
 Total: ${formatCurrency(total)}
 
-
+${
+  invoice.notes?.trim()
+    ? `
+NOTES
+═══════════════
+${invoice.notes.trim()}
+`
+    : ""
+}
 
 ATTACHMENT
 ═══════════════