gum_env.lua is fed into the compositor environment via hl.env at login,
but that environment is captured once and is not refreshed on a theme
switch. Terminals launched through uwsm-app inherit the caller's
environment (scopes don't read systemctl --user set-environment), so a
floating terminal would show the login-time theme's gum colors.
Extract the export logic into a sourced omarchy-restart-gum helper and
source it from the presentation terminal launcher so gum widgets match
the active theme.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
