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/views/OnboardingBackup.vue

@@ -15,7 +15,7 @@
       <!-- Content Area -->
       <div class="flex flex-col items-center gap-4 sm:gap-6 mb-4 sm:mb-6 px-3 sm:px-4">
         <div class="w-full max-w-[600px] space-y-4 sm:space-y-6">
-          <p v-if="serverStarting" class="text-orange-400/80 text-sm">Server is still starting up. You can try again shortly or skip this step.</p>
+          <p v-if="serverStarting" class="text-orange-400/80 text-sm">Server is still starting up. Please try again shortly.</p>
           <p v-else-if="errorMessage" class="text-red-400 text-sm">{{ errorMessage }}</p>
           <!-- Passphrase Input -->
           <div class="path-option-card cursor-default px-4 py-4 sm:px-6 sm:py-6">