feat: Enhanced release notes system, fixed invoice installments, and improved logo integration

- Updated release notes to use new JSON structure with individual commit timestamps
- Removed hash display from release notes for cleaner UI
- Fixed automatic recalculation of percentage-based installments in Invoice Editor and Preview
- Integrated custom logo.svg in header and footer with cleaner styling
- Moved all data files to /public/data/ for better organization
- Cleaned up unused release data files and improved file structure

src/pages/InvoicePreview.js

@@ -20,6 +20,30 @@ const InvoicePreview = () => {
   const [isGenerating, setIsGenerating] = useState(false);
   const [selectedTemplate] = useState('minimal');
 
+  // Calculate totals (same logic as InvoiceEditor)
+  const calculateTotals = (items, discount = 0, fees = [], discounts = []) => {
+    const subtotal = items.reduce((sum, item) => sum + (item.amount || 0), 0);
+    
+    // Calculate total fees
+    const totalFees = fees.reduce((sum, fee) => {
+      const feeAmount = fee.type === 'percentage' 
+        ? (subtotal * fee.value) / 100
+        : fee.value;
+      return sum + feeAmount;
+    }, 0);
+    
+    // Calculate total discounts
+    const totalDiscounts = discounts.reduce((sum, discountItem) => {
+      const discountAmount = discountItem.type === 'percentage' 
+        ? (subtotal * discountItem.value) / 100
+        : discountItem.value;
+      return sum + discountAmount;
+    }, 0);
+    
+    const total = subtotal + totalFees - discount - totalDiscounts;
+    return { subtotal, total };
+  };
+
   // Load invoice data from localStorage
   useEffect(() => {
     try {
@@ -28,11 +52,41 @@ const InvoicePreview = () => {
       
       if (savedInvoice) {
         const parsedInvoice = JSON.parse(savedInvoice);
+        
+        // Recalculate totals and installments to ensure accuracy
+        const { subtotal, total } = calculateTotals(
+          parsedInvoice.items || [],
+          parsedInvoice.discount || 0,
+          parsedInvoice.fees || [],
+          parsedInvoice.discounts || []
+        );
+
+        // Update totals
+        parsedInvoice.subtotal = subtotal;
+        parsedInvoice.total = total;
+
+        // Recalculate installments if they exist
+        if (parsedInvoice.paymentTerms?.installments?.length > 0) {
+          const updatedInstallments = parsedInvoice.paymentTerms.installments.map(installment => {
+            if (installment.type === 'percentage') {
+              const baseAmount = parsedInvoice.paymentTerms?.type === 'downpayment' 
+                ? total - (parsedInvoice.paymentTerms?.downPayment?.amount || 0)
+                : total;
+              const amount = (baseAmount * (installment.percentage || 0)) / 100;
+              return { ...installment, amount };
+            }
+            return installment;
+          });
+
+          parsedInvoice.paymentTerms = {
+            ...parsedInvoice.paymentTerms,
+            installments: updatedInstallments
+          };
+        }
+
         setInvoiceData(parsedInvoice);
-        // Set page title with invoice number
-        document.title = `Invoice Preview - ${parsedInvoice.invoiceNumber || 'Draft'} | DevTools`;
       } else {
-        // No invoice data, redirect back to editor
+        // No invoice data found, redirect to editor
         navigate('/invoice-editor');
       }
       
@@ -41,11 +95,10 @@ const InvoicePreview = () => {
       }
     } catch (error) {
       console.error('Failed to load invoice data:', error);
-      navigate('/invoice-editor', { replace: true });
+      navigate('/invoice-editor');
     }
   }, [navigate]);
 
-
   // Format number with thousand separator
   const formatNumber = (num) => {
     if (!invoiceData?.settings?.thousandSeparator) return num.toString();