Trackball Pointer Mode & driver rewrite (#453)

Tactility/Include/Tactility/Assets.h

@@ -10,6 +10,7 @@
 
 // UI
 #define TT_ASSETS_UI_SPINNER TT_ASSET("spinner.png")
+#define TT_ASSETS_UI_CURSOR TT_ASSET("cursor.png")
 
 // App icons
 #define TT_ASSETS_APP_ICON_FALLBACK TT_ASSET("app_icon_fallback_dark_mode.png")

Tactility/Include/Tactility/settings/KeyboardSettings.h

@@ -5,11 +5,10 @@
 namespace tt::settings::keyboard {
 
 struct KeyboardSettings {
-    bool backlightEnabled;
-    uint8_t backlightBrightness; // 0-255
-    bool trackballEnabled;
-    bool backlightTimeoutEnabled;
-    uint32_t backlightTimeoutMs; // Timeout in milliseconds
+    bool backlightEnabled = true;
+    uint8_t backlightBrightness = 127; // 0-255
+    bool backlightTimeoutEnabled = true;
+    uint32_t backlightTimeoutMs = 60000; // Timeout in milliseconds
 };
 
 bool load(KeyboardSettings& settings);

Tactility/Include/Tactility/settings/TrackballSettings.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <cstdint>
+
+namespace tt::settings::trackball {
+
+enum class TrackballMode : uint8_t {
+    Encoder = 0,  // Scroll wheel navigation (default)
+    Pointer = 1   // Mouse cursor mode
+};
+
+struct TrackballSettings {
+    bool trackballEnabled = false;
+    TrackballMode trackballMode = TrackballMode::Encoder;
+    uint8_t encoderSensitivity = 1;   // Steps per tick (1-10)
+    uint8_t pointerSensitivity = 10;  // Pixels per tick (1-10)
+};
+
+bool load(TrackballSettings& settings);
+
+TrackballSettings loadOrGetDefault();
+
+TrackballSettings getDefault();
+
+bool save(const TrackballSettings& settings);
+
+}