fix: improve profile avatar alignment and styling

- Add left margin to inset avatar from banner edge
- Use dark background color for avatar
- Add object-fit: cover to prevent image stretching
- Add profile-avatar CSS class with border and shadow

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

templates/nostrmarket/components/merchant-tab.html

@@ -155,19 +155,16 @@
         </div>
 
         <!-- Profile Section -->
-        <q-card-section class="q-pt-none" style="margin-top: -50px">
+        <q-card-section class="q-pt-none q-ml-md" style="margin-top: -50px">
           <div class="row">
             <!-- Profile Image -->
             <div class="col-auto">
-              <q-avatar
-                size="100px"
-                style="border: 4px solid white; background: white"
-                class="flex flex-center"
-              >
+              <q-avatar size="100px" color="dark" class="profile-avatar">
                 <img
                   v-if="merchantConfig && merchantConfig.picture"
                   :src="merchantConfig.picture"
                   @error="handleImageError"
+                  style="object-fit: cover"
                 />
                 <q-icon
                   v-else

templates/nostrmarket/index.html

@@ -424,6 +424,16 @@
     margin-left: auto;
     width: 100%;
   }
+
+  .profile-avatar {
+    border: 3px solid var(--q-dark-page);
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
+  }
+
+  .profile-avatar .q-avatar__content {
+    overflow: hidden;
+    border-radius: 50%;
+  }
 </style>
 
 <template id="nostr-keys-dialog"