Refactor LVGL code into kernel module (#472)

* **New Features**
  * Added a standalone LVGL module and enabled LVGL support in the simulator for richer local UI testing.

* **Refactor**
  * HAL and LVGL split into distinct modules; startup and device attach/detach flows reorganized for clearer lifecycle management.
  * Public APIs tightened with clearer nullability/documentation.

* **Bug Fixes**
  * More consistent LVGL start/stop and device attach/detach behavior for improved stability.

Tactility/Source/file/FileLock.cpp

@@ -5,7 +5,7 @@
 
 namespace tt::file {
 
-std::shared_ptr<Lock> _Nullable findLock(const std::string& path) {
+std::shared_ptr<Lock> findLock(const std::string& path) {
     return hal::sdcard::findSdCardLock(path);
 }