- Target overlay works without active processing: route pre-loads calibration
and display info from the CSS store, passes to processor as fallback
- Fix server crash on repeated overlay: replace per-window tk.Tk() with single
persistent hidden root; each overlay is a Toplevel child dispatched via
root.after() — eliminates Tcl interpreter crashes on Windows
- Fix edge test colors not lighting up: always call set_test_mode regardless
of processing state (was guarded by 'not proc.is_running'); pass calibration
so _send_test_pixels knows which LEDs map to which edges
- Fix device reset on overlay stop: keep idle serial client cached after
clearing test mode; start_processing() already closes it before connecting
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
alexei.dolgolyov
018bedf9f6