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/stores/server.ts

@@ -9,8 +9,9 @@ import type { InstallProgress } from '../views/marketplace/marketplaceData'
 export const useServerStore = defineStore('server', () => {
   const sync = useSyncStore()
 
-  // Global install tracking — persists across navigation
+  // Global install/uninstall tracking — persists across navigation
   const installingApps = ref<Map<string, InstallProgress>>(new Map())
+  const uninstallingApps = ref<Set<string>>(new Set())
 
   function setInstallProgress(appId: string, progress: Partial<InstallProgress> & { id: string; title: string }) {
     const existing = installingApps.value.get(appId)
@@ -94,11 +95,12 @@ export const useServerStore = defineStore('server', () => {
     isShuttingDown,
     isOffline,
 
-    // Install tracking (global, persists across navigation)
+    // Install/uninstall tracking (global, persists across navigation)
     installingApps,
     setInstallProgress,
     clearInstallProgress,
     isInstalling,
+    uninstallingApps,
 
     // Actions
     installPackage,