revert(TASK-31): remove broken sticky nav — needs proper approach

Reverted inline-style sticky header. The hack used hardcoded rgba
background that didn't match across screens and shifted position
between tabs. Will implement properly with a shared layout component.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

neode-ui/src/views/Apps.vue

@@ -1,7 +1,7 @@
 <template>
   <div class="pb-6">
-    <!-- Desktop: page tabs + category tabs + search (sticky on scroll) -->
-    <div class="hidden md:flex mb-4 items-center gap-4 sticky top-0 z-10 py-3 -mt-3 -mx-6 px-6" style="background: rgba(0,0,0,0.6); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);">
+    <!-- Desktop: page tabs + category tabs + search -->
+    <div class="hidden md:flex mb-4 items-center gap-4">
       <div class="mode-switcher flex-shrink-0">
         <button class="mode-switcher-btn" :class="{ 'mode-switcher-btn-active': activeTab === 'apps' }" @click="activeTab = 'apps'; router.replace({ query: {} })">My Apps</button>
         <RouterLink to="/dashboard/marketplace" class="mode-switcher-btn">App Store</RouterLink>

neode-ui/src/views/Marketplace.vue

@@ -74,8 +74,8 @@
       </div>
     </div>
 
-      <!-- Desktop: tabs + categories + search (sticky on scroll) -->
-      <div class="hidden md:flex mb-4 items-center gap-4 sticky top-0 z-10 py-3 -mt-3 -mx-6 px-6" style="background: rgba(0,0,0,0.6); backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);">
+      <!-- Desktop: tabs + categories + search -->
+      <div class="hidden md:flex mb-4 items-center gap-4">
         <div class="mode-switcher flex-shrink-0">
           <RouterLink to="/dashboard/apps" class="mode-switcher-btn">My Apps</RouterLink>
           <RouterLink to="/dashboard/marketplace" class="mode-switcher-btn mode-switcher-btn-active">App Store</RouterLink>