update: icon mechanic

frontend/src/app/components/item-form/item-form.scss

@@ -19,3 +19,46 @@ mat-form-field {
   gap: 10px;
   margin-top: 20px;
 }
+
+.icon-mode-toggle {
+  margin: 16px 0;
+}
+
+.icon-picker-section {
+  .icon-preview {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding: 16px;
+    background-color: #f5f5f5;
+    border-radius: 4px;
+    margin-bottom: 16px;
+    
+    .preview-label {
+      font-weight: 500;
+      color: #666;
+    }
+    
+    .preview-icon {
+      font-size: 48px;
+      width: 48px;
+      height: 48px;
+      color: #1976d2;
+    }
+  }
+}
+
+::ng-deep {
+  .mat-mdc-option {
+    .icon-option-text {
+      margin-left: 12px;
+      margin-right: auto;
+    }
+    
+    .icon-category {
+      font-size: 12px;
+      color: #666;
+      margin-left: 8px;
+    }
+  }
+}