fix: disable boot reconciler, fix onboarding loop, UI polish

Critical flow fixes:
- Disable boot reconciliation that auto-created ALL containers on
  unbundled installs (only FileBrowser should exist on first boot)
- Fix onboarding loop: RootRedirect no longer clears the
  neode_onboarding_complete flag on boot screen completion
- Seed phrase persists when navigating back (no regeneration)

UI fixes:
- Boot screen: removed github and save icons from animation loop
- Seed screens: viewport height scaling with 100dvh
- Seed restore: removed outer card container from word input grid
- Seed screens use distinct background (bg-intro-1.jpg)
- Install progress simplified to "Installing" button style
- Uninstall state moved to global store (persists across navigation)

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

neode-ui/src/views/apps/AppCard.vue

@@ -13,17 +13,14 @@
     <!-- Installing overlay -->
     <div
       v-if="isInstalling"
-      class="absolute inset-0 z-20 flex flex-col items-center justify-center bg-black/70 backdrop-blur-sm rounded-xl gap-2"
+      class="absolute inset-0 z-20 flex items-center justify-center bg-black/70 backdrop-blur-sm rounded-xl"
     >
-      <div class="flex items-center gap-3 text-amber-400">
+      <div class="flex items-center gap-3 text-white/90">
         <svg class="animate-spin h-5 w-5" fill="none" viewBox="0 0 24 24">
           <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle>
           <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"></path>
         </svg>
-        <span class="text-sm font-medium">{{ installProgress?.message || t('common.installing') }}...</span>
-      </div>
-      <div v-if="installProgress" class="w-3/4 h-1 bg-white/10 rounded-full overflow-hidden">
-        <div class="h-full bg-amber-500 rounded-full transition-all" :style="{ width: `${installProgress.progress}%` }"></div>
+        <span class="text-sm font-medium">Installing</span>
       </div>
     </div>