v1.7.25 — partial throw from banner, barcode fallback, related stock, Bring! re-add fix

- Fix: Bring! items re-appearing after manual removal (missing _markBringPurchased call in removeBringItem / confirmShoppingItemFound; autoAddCriticalItems now respects blocklist for qty=0 items)
- Fix: barcode false 'not found' — new _offFetchProduct() helper tries UPC-A↔EAN-13 candidates × 2 locales with auto-retry; UPCItemDB fallback also iterates candidates
- Fix: bannerThrowAway() now opens partial-throw modal (location + qty input + throw-all button) instead of immediately discarding everything
- Add: related stock card on action page — shows same-family inventory items when scanning a branded product

index.html

@@ -333,6 +333,7 @@
         <div id="shopping-scan-target-banner" class="shopping-scan-target-banner" style="display:none"></div>
         <div class="product-preview product-preview-small" id="action-product-preview"></div>
         <div class="inventory-status-bar" id="action-inventory-status" style="display:none"></div>
+        <div id="action-related-stock" style="display:none"></div>
         <div class="action-buttons" id="action-buttons-container">
             <button class="btn btn-huge btn-success" onclick="showAddForm()">
                 <span class="btn-icon">📥</span>