[5.1] — Headless Device Support (T1000-E, RAK WiseMesh TAG)

Headless device support — ui-orig now fully integrated into FieldMesh; devices with no display and a single button (Seeed T1000-E, RAK WiseMesh TAG) are supported as first-class citizens
Off-Grid toggle via 5× click — 5 presses on the single button toggles Off-Grid mode on/off; buzzer feedback is forced regardless of mute state (ascending tone = on, descending = off)
SOS alarm via buzzer — incoming !SOS messages trigger a continuous buzzer siren that overrides quiet mode and loops until acknowledged with a short press

All button actions (advert, GPS toggle, buzzer toggle, Off-Grid toggle) now produce forced buzzer feedback regardless of quiet mode — essential for display-less operation
Ascending tone (c,e) = feature enabled; descending tone (e,c) = feature disabled — consistent across all actions
newMsg() signature updated to include is_favorite parameter — compatible with V5 AbstractUITask interface
refreshDisplay() and isOnRecentOrTrackingPage() added as explicit no-op overrides — required for MyMesh compatibility

Press	Action
1×	Wake display / acknowledge SOS alarm
2×	Send advert
3×	Buzzer mute on/off
4×	GPS on/off
5×	Off-Grid mode on/off
Long press (first 8 s)	CLI Rescue Mode
Long press	Shutdown

Changes confined to ui-orig/Button.h, ui-orig/Button.cpp, ui-orig/UITask.h, ui-orig/UITask.cpp
ui-new (ThinkNode M1, Wio Tracker L1) is completely unaffected
_buzzer_restore_quiet flag ensures non-blocking buzzer playback before quiet state is restored

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