feat: add editing capability

index.html

@@ -149,6 +149,10 @@
                             <div class="search-results" id="searchResults">
                                 <!-- Results will be populated here -->
                             </div>
+
+                            <!-- Hidden inputs for state -->
+                            <input type="hidden" id="foodIdToUpdate">
+                            <input type="hidden" id="foodTimeToUpdate">
                         </div>
                     </div>
                     <div class="form-group">
@@ -156,6 +160,7 @@
                         <input type="number" id="gramAmount" min="1" step="1" value="100">
                     </div>
                     <button class="add-btn" id="add-food-btn">Add Food</button>
+                    <button class="cancel-btn" id="cancel-food-btn">Cancel</button>
                 </div>
                 <div class="display-none" id="food-preview">
                     <div class="nutrition-summary">