fix: resolve did:dht compilation errors

- Simplify DHT encoding: use JSON instead of DNS packets (drop simple-dns)
- Fix mainline crate API: SigningKey takes 32 bytes, get_mutable returns Result
- Add missing dht_did field to IdentityRecord constructor
- Store DID Document as JSON in DHT (DNS encoding deferred)

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

neode-ui/src/views/Apps.vue

@@ -1,8 +1,14 @@
 <template>
   <div class="pb-6">
-    <div class="hidden md:block mb-8">
-      <h1 class="text-3xl font-bold text-white mb-2">{{ t('apps.title') }}</h1>
-      <p class="text-white/70">{{ t('apps.subtitle') }}</p>
+    <div class="hidden md:flex items-start justify-between mb-8 gap-4">
+      <div>
+        <h1 class="text-3xl font-bold text-white mb-2">{{ t('apps.title') }}</h1>
+        <p class="text-white/70">{{ t('apps.subtitle') }}</p>
+      </div>
+      <div class="mode-switcher flex-shrink-0">
+        <RouterLink to="/dashboard/apps" class="mode-switcher-btn mode-switcher-btn-active">My Apps</RouterLink>
+        <RouterLink to="/dashboard/marketplace" class="mode-switcher-btn">App Store</RouterLink>
+      </div>
     </div>
 
     <!-- Search Bar -->