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* fix(display): apply on-demand, brightness and schedule changes mid-screen The main loop read the on-demand mailbox, the on/off schedule and the brightness target once per pass -- once per screen. A dwell can be a minute and a Vegas iteration runs for max_cycle_duration (240s), so on a Pi an on-demand request posted at 10:54:27 was activated at 10:57:24, and two brightness saves 12s apart inside one 30s screen never reached the panel. During Vegas nothing read the mailbox at all: _check_vegas_interrupt only checked on_demand_active, which only the main-loop read sets. _service_pending_changes does the main loop's on-demand poll, expiry, schedule and brightness steps, throttled to PENDING_CHANGES_INTERVAL (the existing 0.25s mailbox floor), on the display thread. It runs from the Vegas interrupt checker, the high-FPS and once-a-second render loops (replacing their direct on-demand poll) and _sleep_with_plugin_updates; between passes it costs one monotonic compare. A brightness change re-pushes the current frame, since the panel only shows it from the next push. Callers act on what it leaves behind: Vegas yields on an on-demand start or the display being scheduled off (and the main loop then blanks instead of rendering a screen), the render loops break on a schedule-off as they already did on a mode change, and the dwell sleep returns early on an on-demand start/stop or a schedule flip -- so the 60s scheduled-off sleep now wakes for an on-demand request. The main loop no longer rotates after a dwell that ended that way, which advanced a new on-demand session past the mode that was asked for. A brightness set_brightness() refuses is not retried until the target changes, so the 4Hz pass doesn't log the same failure (fallback mode) four times a second. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> * test(display): a screen scheduled off midway stops rendering Covers the schedule-off break added to the high-FPS and once-a-second render loops: with the display scheduled off halfway through a 120s screen, neither loop renders for more than one redraw plus one service interval past the boundary. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> --------- Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>