fix: batch beta fixes — 13 issues from 2026-03-28 testing

Frontend (neode-ui):
- Login double-enter: change @keyup.enter to @keydown.enter (#10)
- Login loop on LAN: post-login session verify before navigation (#12)
- Splash flash: reorder isReady/showSplash, add black fallback div (#7)
- Skip button text: remove "skip this step" from onboarding (#8)
- Password UI: import existing ChangePasswordSection in Settings (#11)
- Arrow key focus trap: add tab-order fallback when spatial nav fails (#13)

ISO/Boot (image-recipe):
- Step counter: TOTAL_STEPS=7 → 8 to match actual step count
- GRUB theme: add desktop-image-scale-method stretch, widen menu
- Boot noise: add loglevel=0, rd.systemd.show_status=false to kernel
- USB removal: copy reboot script to tmpfs, exec from there
- Tor setup: rewrite python3 JSON generation as bash heredoc
- Doctor/reconcile: copy scripts into rootfs, fix missing file errors
- zstd: add to rootfs packages for initramfs compression

Docs:
- BETA-ISSUES-20260328.md: full issue tracker
- INSTALL-SCREENS-DESIGN.md: editable TUI mockups

522 tests pass, vue-tsc clean.

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

neode-ui/src/App.vue

@@ -4,7 +4,8 @@
     <SplashScreen v-if="showSplash" @complete="handleSplashComplete" />
 
     <!-- Main App Content - only show after splash and routing is complete -->
-    <RouterView v-if="!showSplash && isReady" />
+    <div v-if="!showSplash && !isReady" class="min-h-screen bg-black" />
+    <RouterView v-else-if="!showSplash && isReady" />
     
     <!-- Spotlight command palette (Cmd+K / Ctrl+K) -->
     <SpotlightSearch />
@@ -211,10 +212,11 @@ onMounted(async () => {
     showSplash.value = true
   } else {
     // Already seen intro, direct route, or boot mode (boot screen handles intro)
-    showSplash.value = false
-    document.body.classList.add('splash-complete')
+    // Set isReady BEFORE hiding splash to prevent flash of partial content
     await router.isReady()
     isReady.value = true
+    showSplash.value = false
+    document.body.classList.add('splash-complete')
   }
 })