Delete product button on expanded card, deleteProduct DB function

- "Уд." button (red) next to "Ред." on product card
- deleteProduct: nullifies food_log refs, zeros recipe_ingredients refs, deletes product
- List refreshes after deletion

frontend/js/db.js

@@ -162,6 +162,13 @@ async function addProduct(p) {
   return rows[0]?.id;
 }
 
+async function deleteProduct(id) {
+  // Reassign food_log and recipe_ingredients to avoid orphaned references
+  await execute("UPDATE food_log SET product_id = NULL WHERE product_id = ?1", [id]);
+  await execute("UPDATE recipe_ingredients SET product_id = 0 WHERE product_id = ?1", [id]);
+  await execute("DELETE FROM products WHERE id = ?1", [id]);
+}
+
 // ---------------------------------------------------------------------------
 // Cooking methods & Recipes
 // ---------------------------------------------------------------------------
@@ -898,6 +905,7 @@ window.DB.saveSleep              = saveSleep;
 window.DB.searchProducts         = searchProducts;
 window.DB.getProduct             = getProduct;
 window.DB.addProduct             = addProduct;
+window.DB.deleteProduct          = deleteProduct;
 window.DB.getFoodForDate         = getFoodForDate;
 window.DB.addFoodManual          = addFoodManual;
 window.DB.addFoodEntry           = addFoodEntry;

frontend/js/main.js

@@ -1295,6 +1295,7 @@ async function renderProducts(container) {
         <div style="display:flex;gap:8px;margin-top:8px">
           <button class="btn-primary prod-add-btn" data-pid="${p.id}" style="flex:1">Добавить в дневник</button>
           <button class="btn-secondary prod-edit-btn" data-pid="${p.id}" style="flex:0">Ред.</button>
+          <button class="btn-secondary prod-del-btn" data-pid="${p.id}" style="flex:0;color:#cf6679">Уд.</button>
         </div>
       </div>`;
   }
@@ -1321,6 +1322,14 @@ async function renderProducts(container) {
         if (p) showEditProductModal(p, () => doSearch(false));
       };
     });
+    el.querySelectorAll(".prod-del-btn").forEach(btn => {
+      btn.onclick = async e => {
+        e.stopPropagation();
+        const pid = parseInt(btn.dataset.pid);
+        await DB.deleteProduct(pid);
+        doSearch(false);
+      };
+    });
   }
 
   function showAddFoodFromProduct(productId) {