Merge upstream companion-v1.17.0 (CAD) into power-saving

Adopts hardware Channel Activity Detection (wired into
RadioLibWrapper::isChannelActive() alongside our RSSI-threshold check
and RX duty-cycle power-save), MCU temperature telemetry, LR2021
standby workaround, DISPLAY_SCALE/FLIP overrides, NRF52Board
shutdownPeripherals() refactor, and misc upstream fixes.

Declines upstream's ConfigSerializer-based NodePrefs rewrite,
MultiSerialInterface/interface_manager, and UIColor palette system —
each would have broken large parts of the Solo-specific feature set
(NodePrefs fields, per-variant single serial_interface, enum-based
DisplayDriver::Color). Flagged as candidate follow-up migrations, not
permanent no's.

Also fixes several pre-existing bugs surfaced while chasing silent
merge breaks (stale newMsg() override signature in ui-tiny/ui-orig,
dead UIEventType::newContactMessage case, missing ContactsIterator
init), bumps FIRMWARE_VERSION/MESHCORE_VERSION to 1.17, and fixes a
missing <cstdlib> include that broke the native ConfigSerializer unit
tests.

Verified via 13+ pio run builds across ESP32/nRF52, all 3 companion UI
variants, and 7 display drivers, plus the full native unit test suite
(33/33 passing).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

variants/heltec_tracker/platformio.ini

@@ -47,6 +47,7 @@ build_src_filter = ${esp32_base.build_src_filter}
 lib_deps =
   ${esp32_base.lib_deps}
   stevemarple/MicroNMEA @ ^2.0.6
+  bodmer/TFT_eSPI @ ^2.4.31
   adafruit/Adafruit ST7735 and ST7789 Library @ ^1.11.0
 
 [env:Heltec_Wireless_Tracker_companion_radio_usb]
@@ -59,6 +60,7 @@ build_flags =
   -D DISPLAY_CLASS=ST7735Display
   -D MAX_CONTACTS=350
   -D MAX_GROUP_CHANNELS=40
+  -D ENABLE_USB_INTERFACE
 ; -D BLE_PIN_CODE=123456 ; HWT will use display for pin
 ; -D OFFLINE_QUEUE_SIZE=256
 ;  -D BLE_DEBUG_LOGGING=1