Merge upstream companion-v1.17.0 (CAD) into power-saving

Adopts hardware Channel Activity Detection (wired into
RadioLibWrapper::isChannelActive() alongside our RSSI-threshold check
and RX duty-cycle power-save), MCU temperature telemetry, LR2021
standby workaround, DISPLAY_SCALE/FLIP overrides, NRF52Board
shutdownPeripherals() refactor, and misc upstream fixes.

Declines upstream's ConfigSerializer-based NodePrefs rewrite,
MultiSerialInterface/interface_manager, and UIColor palette system —
each would have broken large parts of the Solo-specific feature set
(NodePrefs fields, per-variant single serial_interface, enum-based
DisplayDriver::Color). Flagged as candidate follow-up migrations, not
permanent no's.

Also fixes several pre-existing bugs surfaced while chasing silent
merge breaks (stale newMsg() override signature in ui-tiny/ui-orig,
dead UIEventType::newContactMessage case, missing ContactsIterator
init), bumps FIRMWARE_VERSION/MESHCORE_VERSION to 1.17, and fixes a
missing <cstdlib> include that broke the native ConfigSerializer unit
tests.

Verified via 13+ pio run builds across ESP32/nRF52, all 3 companion UI
variants, and 7 display drivers, plus the full native unit test suite
(33/33 passing).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/helpers/ui/ST7789Display.cpp

@@ -26,6 +26,16 @@
   #define SCALE_Y  2.109375f   // 135 / 64
 #endif
 
+#ifdef DISPLAY_SCALE_X
+  #undef SCALE_X
+  #define SCALE_X DISPLAY_SCALE_X
+#endif
+
+#ifdef DISPLAY_SCALE_Y
+  #undef SCALE_Y
+  #define SCALE_Y DISPLAY_SCALE_Y
+#endif
+
 #ifdef OLED_MISC_FIXED_FONT
 // MiscFixedFont.h/LemonIcons.h store each glyph's rows bit-packed
 // *continuously* (Adafruit_GFX's native GFXfont convention -- no per-row byte
@@ -75,6 +85,9 @@ bool ST7789Display::begin() {
 
     display.init();
     display.landscapeScreen();
+    #ifdef DISPLAY_FLIP_VERTICALLY
+    display.flipScreenVertically();
+    #endif
     display.displayOn();
     setCursor(0,0);
 
@@ -92,6 +105,9 @@ void ST7789Display::turnOn() {
     // Re-initialize the display
     display.init();
     display.displayOn();
+    #ifdef DISPLAY_FLIP_VERTICALLY
+    display.flipScreenVertically();
+    #endif
     delay(20);
 
     // Now turn on the backlight
@@ -146,22 +162,22 @@ void ST7789Display::setColor(Color c) {
       display.setColor(OLEDDISPLAY_COLOR::BLACK);
       break;
 #if 0
-    case DisplayDriver::LIGHT : 
+    case DisplayDriver::LIGHT :
       _color = ST77XX_WHITE;
       break;
-    case DisplayDriver::RED : 
+    case DisplayDriver::RED :
       _color = ST77XX_RED;
       break;
-    case DisplayDriver::GREEN : 
+    case DisplayDriver::GREEN :
       _color = ST77XX_GREEN;
       break;
-    case DisplayDriver::BLUE : 
+    case DisplayDriver::BLUE :
       _color = ST77XX_BLUE;
       break;
-    case DisplayDriver::YELLOW : 
+    case DisplayDriver::YELLOW :
       _color = ST77XX_YELLOW;
       break;
-    case DisplayDriver::ORANGE : 
+    case DisplayDriver::ORANGE :
       _color = ST77XX_ORANGE;
       break;
 #endif