Merge upstream/main (v1.16.0) into wio-unified

Merge 254 upstream commits. Highlights relevant to the Wio fork: native
NRF52 companion power-saving (sleep when !hasPendingWork), preamble 16->32
for SF<9, generic sensor-registration model, CMD_SEND_RAW_PACKET, isEink()
display abstraction, KEEP_DISPLAY_ON_USB, contacts-sync/transient fixes.

Conflicts resolved (11 files):
- buzzer.h/.cpp: keep NRF52 include guard + our begin()->startup(); fold in
  upstream doc comment.
- platformio (wio + eink): keep our slim env layout, add upstream kiss_modem
  env (+ debug_tool=stlink on eink ble).
- GxEPDDisplay.h: take upstream isEink() override.
- EnvironmentSensorManager.h: take upstream's wider #if guard.
- DataStore.cpp: take upstream saveContacts(filter) signature, keep our
  ::openWrite (member openWrite would shadow the global 2-arg overload).
- main.cpp: keep our watchdog init + add board.onBootComplete(); adopt
  upstream's `if(!hasPendingWork()) sleep` loop.
- MyMesh.h: version -> v1.16-solo.0, build date 6 Jun 2026.
- MyMesh.cpp: keep both CMD codes (SCREENSHOT 66 + RAW_PACKET 65), both field
  inits, both handlers, our screenshot fns + upstream saveContacts/save_filter,
  upstream hasPendingWork() + our MyMeshBot include.
- UITask.cpp: keep our solo splash/clock page/snprintf/buzzer init; merge
  auto-off (+ opt-in KEEP_DISPLAY_ON_USB); merge low-batt shutdown (our EMA +
  prefs threshold + upstream's !isExternalPowered() guard and eink-aware delay).

Post-merge drift fixes (upstream API/architecture changes, not conflicts):
- applyTxPower(): radio_set_tx_power() removed upstream -> radio_driver.setTxPower().
- Sensor refactor dropped the per-sensor *_initialized flags our
  getAvailableLPPTypes() relied on; removed that override and the SENSORS page
  now derives available LPP types from the populated sensors_lpp buffer.

README kept ours via .gitattributes merge=ours. Builds verified on all 5 Wio
envs (dual, eink dual, radio_ble, dual_dev, eink_dual_dev). Not yet
hardware-verified.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

examples/companion_radio/ui-orig/UITask.cpp

@@ -57,6 +57,7 @@ void UITask::begin(DisplayDriver* display, SensorManager* sensors, NodePrefs* no
 #ifdef PIN_BUZZER
   buzzer.begin();
   buzzer.quiet(_node_prefs->buzzer_quiet);
+  buzzer.startup();
 #endif
 
   // Initialize digital button if available
@@ -341,6 +342,15 @@ void UITask::loop() {
 
       _next_refresh = millis() + 1000;   // refresh every second
     }
+#ifdef KEEP_DISPLAY_ON_USB
+    // Opt-in: refresh the auto-off deadline while externally powered, so the
+    // timer counts from the moment external power is removed. Off by default
+    // because OLED panels burn in quickly; only enable for LCD targets or
+    // where the display is replaceable.
+    if (board.isExternalPowered()) {
+      _auto_off = millis() + AUTO_OFF_MILLIS;
+    }
+#endif
     if (millis() > _auto_off) {
       _display->turnOff();
     }