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/MappedInputManager.cpp

@@ -1,6 +1,9 @@
 #include "MappedInputManager.h"
 
+#include <GfxRenderer.h>
+
 #include "CrossPointSettings.h"
+#include "components/TouchRegistry.h"
 
 bool MappedInputManager::mapButton(const Button button, bool (HalGPIO::*fn)(uint8_t) const) const {
   const auto sideLayout = SETTINGS.sideButtonLayout;
@@ -62,9 +65,23 @@ static constexpr float BACK_GESTURE_FRAC_Y = 0.12f;
 bool MappedInputManager::wasBackGesture() const {
   float nx = 0.0f, ny = 0.0f;
   if (!gpio.wasTouchTap(nx, ny)) return false;
+  // A tap on the theme's header back area (orientation-mapped) acts as Back.
+  int lx = 0, ly = 0;
+  renderer.tapToLogical(nx, ny, lx, ly);
+  int id = 0;
+  if (TouchRegistry::getInstance().hitTest(lx, ly, TouchRegistry::Back, id)) return true;
+  // Fallback corner gesture (panel-native, generous; works even with no Back target).
   return nx <= BACK_GESTURE_FRAC_X && ny <= BACK_GESTURE_FRAC_Y;
 }
 
+bool MappedInputManager::wasItemTapped(int& id) const {
+  float nx = 0.0f, ny = 0.0f;
+  if (!gpio.wasTouchTap(nx, ny)) return false;
+  int lx = 0, ly = 0;
+  renderer.tapToLogical(nx, ny, lx, ly);
+  return TouchRegistry::getInstance().hitTest(lx, ly, TouchRegistry::Item, id);
+}
+
 bool MappedInputManager::wasPressed(const Button button) const {
   // A top-left tap fires on the release frame; expose it on Back's press edge too
   // so menus that act on wasPressed(Back) also respond. Deliberately NOT folded