Inline item editing on Job Details with live pricing and costing updates

- PatchItem: add case-insensitive JSON deserialization; add legacy fallback
  that computes a live breakdown from job items when PricingBreakdownJson is null
- PatchItem: return itemsSubtotal, subtotalBeforeDiscount, subtotalAfterDiscount,
  taxAmount in JSON response for immediate DOM updates
- GetCostingBreakdown: use job.FinalPrice as revenue (not invoice total) so
  costing figures reflect inline edits before an invoice exists
- Details.cshtml: add data-pb attributes to visible pricing rows; add
  job-final-price-display class to visible Total element
- Details.cshtml: wire afterSave callback to call costing.load() after each edit
- inline-item-edit.js: add afterSave hook in commit(); clean up debug logging
- Help docs: add Inline Price Editing sections to Jobs, Quotes, and Invoices
  help articles; add inline editing + job costing revenue notes to AI knowledge base

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

src/PowderCoating.Web/wwwroot/js/inline-item-edit.js

@@ -28,13 +28,10 @@
     // Each key must exactly match a property returned by the server's PatchItem action.
     function updateTotals(cfg, data) {
         const t = cfg.totals || {};
-        console.debug('[inline-edit] updateTotals data:', data, 'totals cfg:', t);
         Object.entries(t).forEach(([key, selector]) => {
             const val = data[key];
-            const els = document.querySelectorAll(selector);
-            console.debug(`[inline-edit] ${key} → "${selector}": val=${val}, elements=${els.length}`);
             if (selector && val !== undefined && val !== null) {
-                els.forEach(el => { el.textContent = fmt(val); });
+                document.querySelectorAll(selector).forEach(el => { el.textContent = fmt(val); });
             }
         });
     }
@@ -143,6 +140,9 @@
                 // Update document-level totals
                 updateTotals(cfg, data);
 
+                // Optional post-save hook (e.g. refresh a dependent card)
+                if (typeof cfg.afterSave === 'function') cfg.afterSave(data);
+
                 // Re-attach click listener for next edit
                 attachListeners(cfg, span);