ESP32-S3 + SX1262 companion-radio (BLE) support for the LilyGo T-Watch S3:
- AXP2101 PMU brought up via XPowersLib (enables the LoRa, display and
sensor power rails)
- ST7789 240x240 display and FT5x06/FT6x36 capacitive touch via LovyanGFX
- on-device UI driven by touch, as the watch has no navigation buttons
Shared changes, both guarded/no-op for existing boards:
- DisplayDriver: add virtual getTouch() (default returns false; LGFXDisplay
already implements it)
- companion ui-new: map touch taps to nav keys when UI_HAS_TOUCH is defined