Two reliability fixes for the Series 3 tray app:
1. Auto-updater no longer dies on a Settings save. _restart_watcher
set+replaced the shared stop_event that the updater loop also keyed
off, so saving settings could kill the updater thread (race). Give
the updater its own app-lifetime event (_app_stop). Same fix as
thor-watcher 0.4.1.
2. Unsniffable .MLG files are now cached, so each is sniffed + logged
once per session instead of every 5-min scan. A long-lived autocall
folder with a few hundred unidentifiable files was flooding the log
(~600K lines in 10 days) and re-reading every header each scan.
Adds test_series3_tray.py (4 lifecycle tests) and test_scan_latest.py
(2 scan tests). Full suite 50 passing. Bump to v1.6.1.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
