merge: upstream/dev into webconfig (v1.16.0 base -> 2026-07-19)

First upstream merge since the 2026-06-06 base (191 upstream commits). 14 files
conflicted; resolutions below.

Fleet-critical check (Constraint 1): upstream reordered NodePrefs members
(rx_boosted_gain / path_hash_mode moved to the struct tail) but did NOT change
/com_prefs. Persistence is written field-by-field at explicit offsets, so member
order is in-memory only. Verified the fork's writeCommonPrefsImage() is
byte-identical to upstream's inline writer at every offset (79 pad, 121, 122,
290-294). No migration needed.

Resolutions:
- CommonCLI.h: kept the fork's NodePrefs (superset) and adopted upstream's
  setRxBoostedGain(bool)->bool signature change, which CommonCLI.cpp now uses to
  report unsupported. Corrected a stale comment claiming rx_boosted_gain lives at
  offset 79 (it is a pad; the field is at 290).
- CommonCLI.cpp: kept the fork's legacy /com_prefs migration and the extracted
  writeCommonPrefsImage() call.
- UITask.cpp: three-way merge - upstream's drawTextCentered + powering-off
  screen, plus the fork's WITH_WEBCONFIG portal/reboot screens.
- ESP32Board.cpp, MeshCore.h, platformio.ini: kept both sides (fork OTA additions
  alongside upstream powerOff/enterDeepSleep and Packet.cpp).
- MicroNMEALocationProvider.h: took upstream's claim/release and added the
  _claims member they depend on.
- MyMesh.cpp/.h (repeater + room server): kept the fork's superset defaults.
- Removed duplicate declarations auto-merge produced: RadioLibWrapper::_cad_enabled
  and MyMesh::getCADEnabled().

Verification: native suite 15/15 (incl. upstream's new test_mesh_tables), both
MQTT smoke builds green, ArduinoJson pin check passes. Hardware validation next.

src/helpers/ESP32Board.cpp

@@ -1,6 +1,7 @@
 #ifdef ESP_PLATFORM
 
 #include "ESP32Board.h"
+#include <target.h>
 
 #if defined(ADMIN_PASSWORD) && !defined(DISABLE_WIFI_OTA)   // Repeater or Room Server only
 #include <WiFi.h>
@@ -419,4 +420,45 @@ bool ESP32Board::otaFromManifest(const char* current_ver, bool dry_run, char rep
 }
 #endif  // WITH_MQTT_BRIDGE
 
+void ESP32Board::powerOff() {
+  enterDeepSleep(0); // Do not wakeup
+}
+
+void ESP32Board::enterDeepSleep(uint32_t secs) {
+  // Power off the display if any
+#ifdef DISPLAY_CLASS
+  display.turnOff();
+#endif
+
+  // Power off LoRa
+  radio_driver.powerOff();
+
+  // Keep LoRa inactive during deepsleep
+  digitalWrite(P_LORA_NSS, HIGH);
+#if defined(CONFIG_IDF_TARGET_ESP32C3) || defined(CONFIG_IDF_TARGET_ESP32C6)
+  gpio_hold_en((gpio_num_t)P_LORA_NSS);
+#else
+  rtc_gpio_hold_en((gpio_num_t)P_LORA_NSS);
+#endif
+
+  // Power off GPS if any
+  if (sensors.getLocationProvider() != NULL) {
+    sensors.getLocationProvider()->stop();
+  }
+
+  // Flush serial buffers
+  Serial.flush();
+  delay(100);
+
+  // Clear stale wakeup sources to avoid ghost wakeup
+  // This is required when Power Management and automatic lightsleep are enabled
+  esp_sleep_disable_wakeup_source(ESP_SLEEP_WAKEUP_ALL);
+
+  if (secs > 0) {
+    esp_sleep_enable_timer_wakeup(secs * 1000000ULL);
+  }
+
+  // Finally set ESP32 into deepsleep
+  esp_deep_sleep_start(); // CPU halts here and never returns!
+}
 #endif