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.

Tests/TactilityKernel/CMakeLists.txt

@@ -14,5 +14,4 @@ add_test(NAME TactilityKernelTests COMMAND TactilityKernelTests)
 target_link_libraries(TactilityKernelTests PUBLIC
     TactilityKernel
     PlatformPosix
-    hal-device
 )

Tests/TactilityKernel/DeviceTest.cpp

@@ -167,10 +167,10 @@ TEST_CASE("device_is_ready should return true only when it is started") {
     Driver driver = {
         .name = "test_driver",
         .compatible = compatible,
-        .startDevice = nullptr,
-        .stopDevice = nullptr,
+        .start_device = nullptr,
+        .stop_device = nullptr,
         .api = nullptr,
-        .deviceType = nullptr,
+        .device_type = nullptr,
         .owner = &module,
         .driver_private = nullptr
     };

Tests/TactilityKernel/DriverIntegrationTest.cpp

@@ -33,10 +33,10 @@ static int stop(Device* device) {
 static Driver integration_driver = {
     .name = "integration_test_driver",
     .compatible = (const char*[]) { "integration", nullptr },
-    .startDevice = start,
-    .stopDevice = stop,
+    .start_device = start,
+    .stop_device = stop,
     .api = nullptr,
-    .deviceType = nullptr,
+    .device_type = nullptr,
     .owner = &module,
     .driver_private = nullptr,
 };

Tests/TactilityKernel/DriverTest.cpp

@@ -35,10 +35,10 @@ TEST_CASE("driver_is_compatible should return true if a compatible value is foun
     Driver driver = {
         .name = "test_driver",
         .compatible = compatible,
-        .startDevice = nullptr,
-        .stopDevice = nullptr,
+        .start_device = nullptr,
+        .stop_device = nullptr,
         .api = nullptr,
-        .deviceType = nullptr,
+        .device_type = nullptr,
         .owner = &module,
         .driver_private = nullptr
     };
@@ -52,10 +52,10 @@ TEST_CASE("driver_find should only find a compatible driver when the driver was
     Driver driver = {
         .name = "test_driver",
         .compatible = compatible,
-        .startDevice = nullptr,
-        .stopDevice = nullptr,
+        .start_device = nullptr,
+        .stop_device = nullptr,
         .api = nullptr,
-        .deviceType = nullptr,
+        .device_type = nullptr,
         .owner = &module,
         .driver_private = nullptr
     };

Tests/TactilityKernel/Main.cpp

@@ -57,9 +57,3 @@ int main(int argc, char** argv) {
     return data.result;
 }
 
-extern "C" {
-    // Required for FreeRTOS
-    void vAssertCalled(unsigned long line, const char* const file) {
-        __assert_fail("assert failed", file, line, "");
-    }
-}