feat: Apply styles to transparency start balance row

Adds CSS class for start balance row to improve table readability
by highlighting the background color of the row. Updates HTML
generation logic to apply the CSS class to the appropriate table row.

Enhances user interface clarity for financial transparency tables.

assets/css/base.css

@@ -342,4 +342,10 @@ h5 {
 
 .accordion-header .bs-icon svg {
   width: 32px;
+}
+
+/* Table Styles */
+
+.transparency-start-balance-row > td {
+  background-color: rgb(234, 255, 255) !important;
 }

helpers/finances.py

@@ -183,7 +183,7 @@ def generate_transparency_table(result, currencies=None):
     """
 
     # Add start balance row
-    html += "<tr><td>Account Balance (start of month)</td>"
+    html += "<tr class=\"transparency-start-balance-row\"><td>Account Balance (start of month)</td>"
     for currency in currencies:
         value = result["start_balance"].get(currency, Decimal(0))
         html += f"<td>{format_value(value, currency)}</td>"