Clarify that rounding entries use real values (not rounded)

- Rounding entries (658000/758000) already use formatAmountReal() for real values
- Added comment to clarify this behavior
- Main balancing entry uses rounded VAT amount from TD line
- Rounding entry uses real difference with decimals
- Ensures proper accounting precision for rounding differences

core/class/declarationtva_pdf.class.php

@@ -2096,7 +2096,7 @@ class DeclarationTVA_PDF
                 );
             }
             
-            // Rounding entry for the remaining difference
+            // Rounding entry for the remaining difference (use real value, not rounded)
             $remaining_diff = abs($difference) - $vat_td_amount;
             if ($remaining_diff >= 0.01) {
                 if ($difference < 0) {