Fix inline edit not updating pricing breakdown on Job Details

Jobs/PatchItem now returns the full breakdown (itemsSubtotal,
subtotalBeforeDiscount, subtotalAfterDiscount, taxAmount) so all rows
in the pricing card update live without a page refresh.

Added data-pb attributes to the matching spans in the pricing panel.
Updated window.inlineItemEdit.totals config for jobs to map each
response key to its DOM selector.

updateTotals in inline-item-edit.js is now fully generic — cfg.totals
keys must match server response property names directly, eliminating
the old hardcoded tax/taxAmount and balance/balanceDue mismatches.
Updated Quote and Invoice configs accordingly (tax→taxAmount,
balance→balanceDue).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Views/Invoices/Details.cshtml

@@ -1458,9 +1458,9 @@
         canEdit:  @Json.Serialize(canEdit),
         totals: {
             subtotal:   '#inv-subtotal',
-            tax:        '#inv-tax',
+            taxAmount:  '#inv-tax',
             total:      '#inv-total',
-            balance:    '#inv-balance'
+            balanceDue: '#inv-balance'
         }
     };
 </script>