fix(user-app): rebuild product gallery with fullscreen preview, fix icon reactivity bug

- Extract product image gallery into a dedicated GallerySlider component
  with swipe/tap support
- Add a teleported fullscreen image preview (tap to open, thumbnail strip,
  body scroll lock) to SingleProduct
- Restore the Trust section that was accidentally commented out
- Swap back/favorite button positions and recenter the image counter
- Fix Icon.vue: tempIcon was a static ref set once at setup, so it never
  updated on prop change when Vue reused the component instance (e.g. cart
  qty steppers toggling trash/minus icons); switched to computed + watch
- Rename brand text from "منتزر" to "هنزاگلد"
- Fix a CSS typo in user-app-v2 SingleProduct (rgba alpha value)
- Rebuild dist assets

apps/user-app/dist/index.html

@@ -9,8 +9,8 @@
     <meta name="background-color" content="#1C2D56" />
     <meta content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no" name="viewport" />
     <title>طلای منتزر</title>
-    <script type="module" crossorigin src="/assets/index-CtDx9pmc.js"></script>
-    <link rel="stylesheet" crossorigin href="/assets/index-8vi5Klr2.css">
+    <script type="module" crossorigin src="/assets/index-CGo5tz1H.js"></script>
+    <link rel="stylesheet" crossorigin href="/assets/index-Bio3zTgc.css">
   <link rel="manifest" href="/manifest.webmanifest"></head>
   <body style="background-color: #1C2D56">
     <div class="bg-white w-screen h-screen fixed"></div>