Add touch-to-logical coordinate mapping for UI

Implements tapToLogical() to convert normalized touch coordinates to orientation-aware logical screen coordinates. Adds TouchRegistry hit testing for interactive UI elements and header back button. Touch gestures now work correctly across all screen orientations (Portrait, Landscape, etc.) by inverting the rotateCoordinates transform.

src/main.cpp

@@ -28,14 +28,15 @@
 #include "activities/Activity.h"
 #include "activities/ActivityManager.h"
 #include "activities/settings/SdFirmwareUpdateActivity.h"
+#include "components/TouchRegistry.h"
 #include "components/UITheme.h"
 #include "fontIds.h"
 #include "images/LoadingIcon.h"
 #include "util/ButtonNavigator.h"
 #include "util/ScreenshotUtil.h"
 
-MappedInputManager mappedInputManager(gpio);
 GfxRenderer renderer(display);
+MappedInputManager mappedInputManager(gpio, renderer);
 ActivityManager activityManager(renderer, mappedInputManager);
 FontDecompressor fontDecompressor;
 SdCardFontSystem sdFontSystem;
@@ -339,6 +340,9 @@ void setup() {
   silentRebootTarget = 0;
 
   gpio.begin();
+  // Enable touch-target registration only on boards with a touch panel (no-op cost
+  // on the C3). Must come after gpio.begin() so the controller has been probed.
+  TouchRegistry::getInstance().setEnabled(gpio.hasTouch());
   powerManager.begin();
   halTiltSensor.begin();
   halClock.begin();