Fix terminal-mode re-enabling after escape

[Copilot]

When skkeleton is used in terminal mode, re-enabling after <Esc> could be routed through the escape state instead of the enable path, leaving skkeleton inactive. PR #252 removed the resulting error but did not restore activation.

• Enable flow: Allow enable to proceed directly when the current state is escape.
• Regression coverage: Add a test covering re-enabling from escape state in terminal mode.

if (
  oldState.type !== "escape" &&
  (oldState.type !== "input" || oldState.mode !== "direct") &&
  vimStatus
) {
  return handle(opts, vimStatus);
}