[FIX] website_sale_aplicoop: Complete infinite scroll and search filter integration

Major fixes:
- Fix JSON body parsing in load_products_ajax with type='http' route
  * Parse JSON from request.httprequest.get_data() instead of post params
  * Correctly read page, search, category from JSON request body

- Fix search and category filter combination
  * Use intersection (&) instead of replacement to preserve both filters
  * Now respects search AND category simultaneously

- Integrate realtime_search.js with infinite_scroll.js
  * Add resetWithFilters() method to reset scroll to page 1 with new filters
  * When search/category changes, reload products from server
  * Clear grid and load fresh results

- Fix pagination reset logic
  * Set currentPage = 0 in resetWithFilters() so loadNextPage() increments to 1
  * Prevents loading empty page 2 when resetting filters

Results:
✅ Infinite scroll loads all pages correctly (1, 2, 3...)
✅ Search filters work across all products (not just loaded)
✅ Category filters work correctly
✅ Search AND category filters work together
✅ Page resets to 1 when filters change

website_sale_aplicoop/controllers/website_sale.py

@@ -1380,7 +1380,7 @@ class AplicoopWebsiteSale(WebsiteSale):
 
     @http.route(
         ["/eskaera/<int:order_id>/load-products-ajax"],
-        type="json",
+        type="http",
         auth="user",
         website=True,
         methods=["POST"],
@@ -1407,17 +1407,27 @@ class AplicoopWebsiteSale(WebsiteSale):
             )
         )
 
-        # Get page from POST
+        # Parse JSON body for parameters (type="http" doesn't auto-parse JSON)
+        params = {}
         try:
-            page = int(post.get("page", 1))
+            if request.httprequest.content_length:
+                data = request.httprequest.get_data(as_text=True)
+                if data:
+                    params = json.loads(data)
+        except (ValueError, json.JSONDecodeError, AttributeError):
+            params = {}
+
+        # Get page from POST/JSON
+        try:
+            page = int(params.get("page", post.get("page", 1)))
             if page < 1:
                 page = 1
         except (ValueError, TypeError):
             page = 1
 
         # Get filters
-        search_query = post.get("search", "").strip()
-        category_filter = str(post.get("category", "0"))
+        search_query = params.get("search", post.get("search", "")).strip()
+        category_filter = str(params.get("category", post.get("category", "0")))
 
         _logger.info(
             "load_products_ajax: order_id=%d, page=%d, search=%s, category=%s",
@@ -1477,7 +1487,8 @@ class AplicoopWebsiteSale(WebsiteSale):
                             lambda p: p.categ_id.id in order_cat_ids
                         )
 
-                    filtered_products = cat_filtered
+                    # Preserve search filter by using intersection
+                    filtered_products = filtered_products & cat_filtered
             except (ValueError, TypeError) as e:
                 _logger.warning(
                     "load_products_ajax: Invalid category filter: %s", str(e)
@@ -1556,7 +1567,7 @@ class AplicoopWebsiteSale(WebsiteSale):
             }
 
         # Render HTML
-        html = request.env["ir.ui.view"]._render(
+        html = request.env["ir.ui.view"]._render_template(
             "website_sale_aplicoop.eskaera_shop_products",
             {
                 "group_order": group_order,
@@ -1571,13 +1582,18 @@ class AplicoopWebsiteSale(WebsiteSale):
             },
         )
 
-        return {
-            "html": html,
-            "has_next": has_next,
-            "next_page": page + 1,
-            "total": total_products,
-            "page": page,
-        }
+        return request.make_response(
+            json.dumps(
+                {
+                    "html": html,
+                    "has_next": has_next,
+                    "next_page": page + 1,
+                    "total": total_products,
+                    "page": page,
+                }
+            ),
+            [("Content-Type", "application/json")],
+        )
 
     @http.route(
         ["/eskaera/add-to-cart"],