feat: enhance icon button and quantity selector styles for improved UI and functionality

src/app/shared/components/icon-button/icon-button.component.scss

@@ -12,14 +12,18 @@
   padding: 4px;
   margin: 0;
   color: #666666;
-  font-size: 20px;
   cursor: pointer;
   outline: none;
   transition: color 0.15s ease-in-out, transform 0.1s ease-in-out;
   border-radius: 4px;
 
   i {
-    display: inline-block;
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 13px;
+    height: 13px;
+    font-size: 13px;
     line-height: 1;
   }
 
@@ -62,3 +66,11 @@
 :host(.hover-preview) .icon-btn--trash:not(:disabled) {
   color: var(--tenant-danger);
 }
+
+.icon-btn--user {
+  i {
+    width: 23px;
+    height: 23px;
+    font-size: 23px;
+  }
+}