Add Thinknode M4 variant_shutdown()

* Consolidate LoRa params / preset logic and fix display of preset values

* Move preset coercion logic to RadioInterface

* Fix some warnings

* Fix warnings

* STM32 fix

* Add unit tests

* Update src/mesh/RadioInterface.h

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

variants/esp32s3/heltec_wireless_tracker_v2/platformio.ini

@@ -1,8 +1,17 @@
 [env:heltec-wireless-tracker-v2]
+custom_meshtastic_support_level = 1
+custom_meshtastic_images = heltec_wireless_tracker_v2.svg
+custom_meshtastic_tags = Heltec
+
 extends = esp32s3_base
 board = heltec_wireless_tracker_v2
 board_build.partitions = default_8MB.csv
 upload_protocol = esptool
+custom_meshtastic_hw_model = 113
+custom_meshtastic_hw_model_slug = HELTEC_WIRELESS_TRACKER_V2
+custom_meshtastic_architecture = esp32s3
+custom_meshtastic_display_name = Heltec Wireless Tracker V2
+custom_meshtastic_actively_supported = true
 
 build_flags = 
   ${esp32s3_base.build_flags}

variants/nrf52840/ELECROW-ThinkNode-M4/variant.cpp

@@ -49,3 +49,21 @@ void initVariant()
     pinMode(Battery_LED_4, OUTPUT);
     ledOff(Battery_LED_4);
 }
+
+/// called from main-nrf52.cpp during the cpuDeepSleep() function
+void variant_shutdown()
+{
+    for (int pin = 0; pin < 48; pin++) {
+        if (pin == PIN_GPS_EN || pin == PIN_BUTTON1) {
+            continue;
+        }
+        pinMode(pin, OUTPUT);
+        digitalWrite(pin, LOW);
+        if (pin >= 32) {
+            NRF_P1->DIRCLR = (1 << (pin - 32));
+        } else {
+            NRF_GPIO->DIRCLR = (1 << pin);
+        }
+    }
+    digitalWrite(PIN_GPS_EN, HIGH);
+}