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.vue

@@ -111,7 +111,7 @@
         :is-loading="!!actions.loadingActions.value[id as string]"
         :is-installing="serverStore.isInstalling(id as string)"
         :install-progress="serverStore.installingApps.get(id as string)"
-        :is-uninstalling="actions.uninstallingApps.value.has(id as string)"
+        :is-uninstalling="actions.uninstallingApps.has(id as string)"
         @go-to-app="goToApp"
         @launch="launchApp"
         @start="actions.startApp"