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/app/App.cpp

@@ -5,7 +5,7 @@ namespace tt::app {
 
 constexpr auto* TAG = "App";
 
-LaunchId start(const std::string& id, std::shared_ptr<const Bundle> _Nullable parameters) {
+LaunchId start(const std::string& id, std::shared_ptr<const Bundle> parameters) {
     const auto service = service::loader::findLoaderService();
     assert(service != nullptr);
     return service->start(id, std::move(parameters));
@@ -35,15 +35,15 @@ bool isRunning(const std::string& id) {
     return service->isRunning(id);
 }
 
-std::shared_ptr<AppContext> _Nullable getCurrentAppContext() {
+std::shared_ptr<AppContext> getCurrentAppContext() {
     const auto service = service::loader::findLoaderService();
     assert(service != nullptr);
     return service->getCurrentAppContext();
 }
 
-std::shared_ptr<App> _Nullable getCurrentApp() {
+std::shared_ptr<App> getCurrentApp() {
     const auto app_context = getCurrentAppContext();
-    return (app_context !=  nullptr) ? app_context->getApp() : nullptr;
+    return (app_context != nullptr) ? app_context->getApp() : nullptr;
 }
 
 }

Tactility/Source/app/AppRegistration.cpp

@@ -39,7 +39,7 @@ bool removeAppManifest(const std::string& id) {
     return app_manifest_map.erase(id) == 1;
 }
 
-_Nullable std::shared_ptr<AppManifest> findAppManifestById(const std::string& id) {
+std::shared_ptr<AppManifest> findAppManifestById(const std::string& id) {
     hash_mutex.lock();
     auto result = app_manifest_map.find(id);
     hash_mutex.unlock();

Tactility/Source/app/ElfApp.cpp

@@ -34,13 +34,13 @@ class ElfApp final : public App {
 public:
 
     struct Parameters {
-        CreateData _Nullable createData = nullptr;
-        DestroyData _Nullable destroyData = nullptr;
-        OnCreate _Nullable onCreate = nullptr;
-        OnDestroy _Nullable onDestroy = nullptr;
-        OnShow _Nullable onShow = nullptr;
-        OnHide _Nullable onHide = nullptr;
-        OnResult _Nullable onResult = nullptr;
+        CreateData createData = nullptr;
+        DestroyData destroyData = nullptr;
+        OnCreate onCreate = nullptr;
+        OnDestroy onDestroy = nullptr;
+        OnShow onShow = nullptr;
+        OnHide onHide = nullptr;
+        OnResult onResult = nullptr;
     };
 
     static void setParameters(const Parameters& parameters) {
@@ -202,13 +202,13 @@ size_t ElfApp::staticParametersSetCount = 0;
 std::shared_ptr<Lock> ElfApp::staticParametersLock = std::make_shared<Mutex>();
 
 void setElfAppParameters(
-    CreateData _Nullable createData,
-    DestroyData _Nullable destroyData,
-    OnCreate _Nullable onCreate,
-    OnDestroy _Nullable onDestroy,
-    OnShow _Nullable onShow,
-    OnHide _Nullable onHide,
-    OnResult _Nullable onResult
+    CreateData createData,
+    DestroyData destroyData,
+    OnCreate onCreate,
+    OnDestroy onDestroy,
+    OnShow onShow,
+    OnHide onHide,
+    OnResult onResult
 ) {
     ElfApp::setParameters({
         .createData = createData,

Tactility/Source/app/apphub/AppHubApp.cpp

@@ -30,7 +30,7 @@ class AppHubApp final : public App {
     std::vector<AppHubEntry> entries;
     Mutex mutex;
 
-    static std::shared_ptr<AppHubApp> _Nullable findAppInstance() {
+    static std::shared_ptr<AppHubApp> findAppInstance() {
         auto app_context = getCurrentAppContext();
         if (app_context->getManifest().appId != manifest.appId) {
             return nullptr;

Tactility/Source/app/i2cscanner/I2cScanner.cpp

@@ -71,7 +71,7 @@ public:
 };
 
 /** Returns the app data if the app is active. Note that this could clash if the same app is started twice and a background thread is slow. */
-std::shared_ptr<I2cScannerApp> _Nullable optApp() {
+std::shared_ptr<I2cScannerApp> optApp() {
     auto appContext = getCurrentAppContext();
     if (appContext != nullptr && appContext->getManifest().appId == manifest.appId) {
         return std::static_pointer_cast<I2cScannerApp>(appContext->getApp());

Tactility/Source/app/power/Power.cpp

@@ -20,7 +20,7 @@ extern const AppManifest manifest;
 class PowerApp;
 
 /** Returns the app data if the app is active. Note that this could clash if the same app is started twice and a background thread is slow. */
-std::shared_ptr<PowerApp> _Nullable optApp() {
+std::shared_ptr<PowerApp> optApp() {
     auto appContext = getCurrentAppContext();
     if (appContext != nullptr && appContext->getManifest().appId == manifest.appId) {
         return std::static_pointer_cast<PowerApp>(appContext->getApp());

Tactility/Source/app/screenshot/Screenshot.cpp

@@ -49,7 +49,7 @@ public:
 
 
 /** Returns the app data if the app is active. Note that this could clash if the same app is started twice and a background thread is slow. */
-std::shared_ptr<ScreenshotApp> _Nullable optApp() {
+std::shared_ptr<ScreenshotApp> optApp() {
     auto appContext = getCurrentAppContext();
     if (appContext != nullptr && appContext->getManifest().appId == manifest.appId) {
         return std::static_pointer_cast<ScreenshotApp>(appContext->getApp());

Tactility/Source/app/systeminfo/SystemInfo.cpp

@@ -274,7 +274,7 @@ extern const AppManifest manifest;
 
 class SystemInfoApp;
 
-static std::shared_ptr<SystemInfoApp> _Nullable optApp() {
+static std::shared_ptr<SystemInfoApp> optApp() {
     auto appContext = getCurrentAppContext();
     if (appContext != nullptr && appContext->getManifest().appId == manifest.appId) {
         return std::static_pointer_cast<SystemInfoApp>(appContext->getApp());

Tactility/Source/app/wifimanage/View.cpp

@@ -16,7 +16,7 @@ namespace tt::app::wifimanage {
 
 static const auto LOGGER = Logger("WifiManageView");
 
-std::shared_ptr<WifiManage> _Nullable optWifiManage();
+std::shared_ptr<WifiManage> optWifiManage();
 
 static uint8_t mapRssiToPercentage(int rssi) {
     auto abs_rssi = std::abs(rssi);