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().

lib/hal/HalGPIO.h

@@ -90,9 +90,18 @@ class HalGPIO {
   // release frame (alongside wasTouchTap). For tap-vs-long-press decisions.
   unsigned long lastTouchHeldMs() const;
 
+  // Swipe (flick) gesture on the release frame: writes the start/end positions
+  // normalized 0..1 in the panel's native frame (map via GfxRenderer::tapToLogical).
+  // A swipe also raises wasTouchTap(), so check this first. False on non-touch.
+  bool wasSwipe(float& nxStart, float& nyStart, float& nxEnd, float& nyEnd) const;
+
   // True if a touch controller is present/active (runtime gate; false on the C3).
   bool hasTouch() const;
 
+  // True if a touch press or release happened this frame (the touch analogue of
+  // wasAnyPressed/Released), for resetting idle/sleep timers and CPU frequency.
+  bool wasTouchActivity() const;
+
   // Setup wake up GPIO and enter deep sleep
   void startDeepSleep();