Enhance smoke test and fix banner alignment

Smoke test now includes:
- Admin user creation and login
- Regular user creation and workflow
- Encode/decode tests for both user types
- Password recovery QR test
- System health checks

Also fixes Setup Complete banner alignment.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

rpi/first-boot-wizard.sh

@@ -307,7 +307,7 @@ gum style \
   --margin "1" \
   --align center \
   "    .  *  .   .    *    .   *   .  *   .    *   ." \
-  "   ___  _____  ___    ___    _    ___    ___    ___" \
+  "  ___  _____  ___    ___    _    ___    ___    ___" \
   "  / __||_   _|| __|  / __|  /_\\  / __|  / _ \\  / _ \\" \
   "  \\__ \\  | |  | _|  | (_ | / _ \\ \\__ \\ | (_) || (_) |" \
   "  |___/  |_|  |___|  \\___//_/ \\_\\|___/  \\___/  \\___/" \