feat: update AIUI dist (guide as default route) + fix marketplace heading clip

- Rebuild AIUI with guide page as default route (/ -> guide, /chat -> chat)
- Content and context panels start empty
- Fix App Store heading clipped by removing double md:-mt-4 negative margins

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

neode-ui/src/views/Marketplace.vue

@@ -1,7 +1,7 @@
 <template>
-  <div class="marketplace-container flex flex-col h-full overflow-hidden md:-mt-4">
+  <div class="marketplace-container flex flex-col h-full overflow-hidden">
     <!-- Fixed Header Section -->
-    <div class="flex-shrink-0 md:-mt-4">
+    <div class="flex-shrink-0">
     <!-- Installation Progress Banner - Multiple Apps -->
     <div v-if="installingApps.size > 0" class="mb-6 space-y-3">
       <div