Merge upstream companion-v1.18.0

Fixes and features from upstream: MACThenDecrypt / command buffer
overflow fixes, ACK forwarding delay, transport code 0 as unscoped,
hidden nodes don't answer DISCOVER, LR2021/LR1121 fixes, GPS cold-start
detection and waitFor()/drain(), NMEA fix-age counters, ESP32 RTC after a
crash, remote CLI by text message (TXT_TYPE_CLI_COMMAND),
PUSH_CODE_BINARY_RESPONSE, board.loop(), new boards (Wio Tracker L1 1W,
ThinkNode M4/M8, Muzi Base, Waveshare LR1121, Pico W).

Kept ours: NodePrefs, main.cpp, every UI, GxEPDDisplay. The companion CLI
stays MyMeshCli.h's handleCliCommand(); upstream's handleCommand() calls
it. The board's FEM gains go through attachDynamicPrefs() with an adapter
over our NodePrefs fields. Upstream's JSON prefs and MultiSerialInterface
come as their own stages.

Also: the display defaults were inside RADIO_FEM_TXGAIN's #else (a
missing #endif).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

variants/sim/SimMainBoard.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <MeshCore.h>
+#include <helpers/KeyValueStore.h>
 #include <cstdio>
 #include <cstdlib>
 
@@ -20,6 +21,7 @@ class SimMainBoard : public mesh::MainBoard {
 
 public:
   void begin() { }
+  void attachDynamicPrefs(KeyValueStore* prefs) { }  // no-op, as the real boards without their own settings
 
   bool isExternalPowered() override { return externalPowerRef(); }
   static void setExternalPower(bool on) { externalPowerRef() = on; }