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>

image-recipe/branding/grub-theme/theme.txt

@@ -5,17 +5,18 @@
 title-text: ""
 desktop-color: "#0a0a0a"
 desktop-image: "background.png"
+desktop-image-scale-method: "stretch"
 
 + boot_menu {
-    left = 25%
+    left = 15%
     top = 40%
-    width = 50%
-    height = 30%
+    width = 70%
+    height = 35%
     item_color = "#aaaaaa"
     selected_item_color = "#f7931a"
-    item_height = 36
-    item_spacing = 8
-    item_padding = 16
+    item_height = 40
+    item_spacing = 10
+    item_padding = 20
     scrollbar = false
 }