Merge observer firmware and webconfig updates

# Conflicts:
#	MQTT_INTERNALS.md
#	build.sh
#	docs/cli_commands.md
#	examples/simple_repeater/MyMesh.cpp
#	examples/simple_repeater/MyMesh.h
#	examples/simple_repeater/UITask.cpp
#	examples/simple_room_server/MyMesh.cpp
#	examples/simple_room_server/MyMesh.h
#	examples/simple_room_server/UITask.cpp
#	examples/simple_sensor/SensorMesh.cpp
#	platformio.ini
#	scripts/generate_webconfig_html.py
#	src/MeshCore.h
#	src/helpers/CommonCLI.cpp
#	src/helpers/CommonCLI.h
#	src/helpers/CommonCLI_Observer.cpp
#	src/helpers/ESP32Board.h
#	src/helpers/MQTTMessageBuilder.cpp
#	src/helpers/MQTTPresets.h
#	src/helpers/NRF52Board.cpp
#	src/helpers/NRF52Board.h
#	src/helpers/bridges/MQTTBridge.cpp
#	src/helpers/bridges/MQTTBridge.h
#	src/helpers/esp32/WebConfigServer.cpp
#	src/helpers/esp32/WebConfigServer.h
#	src/helpers/radiolib/RadioLibWrappers.cpp
#	src/helpers/radiolib/RadioLibWrappers.h
#	variants/lilygo_tbeam_SX1262/platformio.ini
#	variants/lilygo_tbeam_SX1276/platformio.ini
#	variants/lilygo_tlora_v2_1/platformio.ini
#	webui/index.html

src/helpers/AlertReporter.cpp

@@ -218,6 +218,12 @@ void AlertReporter::onLoop(unsigned long now_ms) {
   // already enforces this on set, but a stale prefs file or future field
   // tweak shouldn't be able to drag the floor below 1 hour and let a
   // flapping link spam the mesh.
+  //
+  // The rate limiter only applies between two real sends: fired_at_ms == 0
+  // means "never fired since boot/config change", and treating it as a send
+  // at millis()==0 would suppress every first alert until uptime reaches
+  // min_interval (observed as a 30-minute alert.mqtt threshold not reporting
+  // until 60 minutes after a reboot).
   uint16_t cfg_min = _obs->alert_min_interval_min;
   if (cfg_min < 60) cfg_min = 60;
   unsigned long min_interval_ms = (unsigned long)cfg_min * 60000UL;