Add UI scaling support for touch vs button devices

Introduces uiScale() method to apply per-board UI scaling based on device type (1.0 for button devices, >1 for touch devices to make UI elements finger-sized). Adds scaledMetrics member to store scaled theme metrics that are returned by getMetrics().

src/MappedInputManager.cpp

@@ -2,6 +2,8 @@
 
 #include <GfxRenderer.h>
 
+#include <cstdlib>
+
 #include "CrossPointSettings.h"
 #include "components/TouchRegistry.h"
 
@@ -116,6 +118,22 @@ bool MappedInputManager::wasCoverTapped(int& id) const {
   return TouchRegistry::getInstance().hitTest(lx, ly, TouchRegistry::Cover, id);
 }
 
+MappedInputManager::SwipeDir MappedInputManager::wasSwipe() const {
+  float nxs = 0.0f, nys = 0.0f, nxe = 0.0f, nye = 0.0f;
+  if (!gpio.wasSwipe(nxs, nys, nxe, nye)) return SwipeDir::None;
+  // Map both endpoints into the logical frame so the direction follows what the
+  // user sees regardless of panel mount/orientation.
+  int sx = 0, sy = 0, ex = 0, ey = 0;
+  renderer.tapToLogical(nxs, nys, sx, sy);
+  renderer.tapToLogical(nxe, nye, ex, ey);
+  const int dx = ex - sx;
+  const int dy = ey - sy;
+  if (std::abs(dx) >= std::abs(dy)) {
+    return dx < 0 ? SwipeDir::Left : SwipeDir::Right;
+  }
+  return dy < 0 ? SwipeDir::Up : SwipeDir::Down;
+}
+
 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