- auto devices/light groups appearing after install get a server-side 'new'
flag (settings.new_device_ids) and a red dot top-right of the icon; opening
the device's editor clears it for every client
- known_devices baseline seeded silently on first run — upgrades never flood
the plan with dots; hand-made markers never flagged
- pure diffNewDevices + unit tests; backend schema; smoke_new_device.mjs;
TESTING.md row
