fix: prevent stale CLI output behind home TUI screens

[cotore-game]

Cause

The home TUI treated an up-to-date result from update.sh as a successful installation and unconditionally re-executed the home screen. whiptail then restored the terminal contents beneath subsequent dialogs, briefly exposing the previous CLI message (for example, the version-is-current text) during later server actions.

Fix

• Re-execute the home screen only if the installed VERSION file actually changed.
• Clear terminal output after the Enter pause and before the next TUI menu. The shared pause path also covers logs, creation, and properties import.
• Add a regression test that verifies the up-to-date path waits for Enter and clears the terminal before the next menu.

Verification

• 131 WSL specification tests passed locally; one nested ZIP test was skipped because zip is not installed locally.
• Bash syntax, locale validation, and git diff --check passed.
• No server data or user configuration was changed during development.