v166 - delayed-frame exit gate
Base: v165 (non-flashing, good shimmer speed).

Problem observed on hardware:
page switching/back-to-main was difficult and screen became striped/blotchy.

Targeted change:
the delayed 125ms B frame is now gated by the visual page active state.
If the user leaves the star page before the delayed frame fires, that pending
B frame is discarded instead of drawing over the next ORHACK page/menu.

One 250ms metro remains.
A immediate + B delayed 125ms remains while visual page is active.
Audio/AUX/LED untouched.
