Various improvements (#461)

* **New Features**
  * Time and delay utilities added (ticks, ms, µs); SD card now uses an expansion-header CS pin; HTTP downloads warn when run on the GUI task and yield to avoid blocking.

* **Bug Fixes / Reliability**
  * Many hard-crash paths converted to guarded checks to reduce abrupt termination and improve stability.

* **Tests**
  * Unit tests added to validate time and delay accuracy.

* **Chores**
  * License header and build/macro updates.

Tactility/Source/lvgl/Spinner.cpp

@@ -42,7 +42,7 @@ static void anim_rotation_callback(void* var, int32_t v) {
     lv_obj_set_style_transform_rotation(object, v, 0);
 }
 
-static void spinner_constructor(TT_UNUSED const lv_obj_class_t* object_class, lv_obj_t* object) {
+static void spinner_constructor(const lv_obj_class_t* object_class, lv_obj_t* object) {
     lv_obj_remove_flag(object, LV_OBJ_FLAG_CLICKABLE);
 
     lv_anim_t a;

Tactility/Source/lvgl/Statusbar.cpp

@@ -1,5 +1,6 @@
 #define LV_USE_PRIVATE_API 1 // For actual lv_obj_t declaration
 
+#include <Tactility/Check.h>
 #include <Tactility/kernel/SystemEvents.h>
 #include <Tactility/Logger.h>
 #include <Tactility/LogMessages.h>
@@ -10,7 +11,6 @@
 #include <Tactility/RecursiveMutex.h>
 #include <Tactility/settings/Time.h>
 #include <Tactility/Tactility.h>
-#include <Tactility/TactilityCore.h>
 #include <Tactility/Timer.h>
 
 #include <lvgl.h>
@@ -116,7 +116,7 @@ static void statusbar_pubsub_event(Statusbar* statusbar) {
     }
 }
 
-static void onTimeChanged(TT_UNUSED kernel::SystemEvent event) {
+static void onTimeChanged(kernel::SystemEvent event) {
     if (statusbar_data.mutex.lock()) {
         statusbar_data.time_update_timer->reset(5);
         statusbar_data.mutex.unlock();
@@ -142,7 +142,7 @@ static void statusbar_constructor(const lv_obj_class_t* class_p, lv_obj_t* obj)
     }
 }
 
-static void statusbar_destructor(TT_UNUSED const lv_obj_class_t* class_p, lv_obj_t* obj) {
+static void statusbar_destructor(const lv_obj_class_t* class_p, lv_obj_t* obj) {
     auto* statusbar = (Statusbar*)obj;
     statusbar_data.pubsub->unsubscribe(statusbar->pubsub_subscription);
 }
@@ -215,7 +215,7 @@ static void update_main(Statusbar* statusbar) {
     }
 }
 
-static void statusbar_event(TT_UNUSED const lv_obj_class_t* class_p, lv_event_t* event) {
+static void statusbar_event(const lv_obj_class_t* class_p, lv_event_t* event) {
     // Call the ancestor's event handler
     lv_result_t result = lv_obj_event_base(&statusbar_class, event);
     if (result != LV_RES_OK) {
@@ -258,7 +258,7 @@ void statusbar_icon_remove(int8_t id) {
     if (LOGGER.isLoggingDebug()) {
         LOGGER.debug("id {}: remove", id);
     }
-    tt_check(id >= 0 && id < STATUSBAR_ICON_LIMIT);
+    check(id >= 0 && id < STATUSBAR_ICON_LIMIT);
     statusbar_data.mutex.lock();
     StatusbarIcon* icon = &statusbar_data.icons[id];
     icon->claimed = false;
@@ -276,10 +276,10 @@ void statusbar_icon_set_image(int8_t id, const std::string& image) {
             LOGGER.debug("id {}: set image {}", id, image);
         }
     }
-    tt_check(id >= 0 && id < STATUSBAR_ICON_LIMIT);
+    check(id >= 0 && id < STATUSBAR_ICON_LIMIT);
     statusbar_data.mutex.lock();
     StatusbarIcon* icon = &statusbar_data.icons[id];
-    tt_check(icon->claimed);
+    check(icon->claimed);
     icon->image = image;
     statusbar_data.mutex.unlock();
     statusbar_data.pubsub->publish(nullptr);
@@ -289,10 +289,10 @@ void statusbar_icon_set_visibility(int8_t id, bool visible) {
     if (LOGGER.isLoggingDebug()) {
         LOGGER.debug("id {}: set visibility {}", id, visible);
     }
-    tt_check(id >= 0 && id < STATUSBAR_ICON_LIMIT);
+    check(id >= 0 && id < STATUSBAR_ICON_LIMIT);
     statusbar_data.mutex.lock();
     StatusbarIcon* icon = &statusbar_data.icons[id];
-    tt_check(icon->claimed);
+    check(icon->claimed);
     icon->visible = visible;
     statusbar_data.mutex.unlock();
     statusbar_data.pubsub->publish(nullptr);

Tactility/Source/lvgl/Toolbar.cpp

@@ -2,6 +2,7 @@
 
 #include <Tactility/lvgl/Toolbar.h>
 
+#include <Tactility/Check.h>
 #include <Tactility/service/loader/Loader.h>
 #include <Tactility/lvgl/Spinner.h>
 
@@ -63,7 +64,7 @@ static const lv_obj_class_t toolbar_class = {
     .theme_inheritable = false
 };
 
-static void stop_app(TT_UNUSED lv_event_t* event) {
+static void stop_app(lv_event_t* event) {
     app::stop();
 }
 
@@ -166,7 +167,7 @@ void toolbar_set_nav_action(lv_obj_t* obj, const char* icon, lv_event_cb_t callb
 
 lv_obj_t* toolbar_add_button_action(lv_obj_t* obj, const char* imageOrButton, bool isImage, lv_event_cb_t callback, void* user_data) {
     auto* toolbar = reinterpret_cast<Toolbar*>(obj);
-    tt_check(toolbar->action_count < TOOLBAR_ACTION_LIMIT, "max actions reached");
+    check(toolbar->action_count < TOOLBAR_ACTION_LIMIT, "max actions reached");
     toolbar->action_count++;
 
     auto ui_scale = hal::getConfiguration()->uiScale;