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/app/wifimanage/WifiManage.cpp

@@ -131,7 +131,7 @@ void WifiManage::onShow(AppContext& app, lv_obj_t* parent) {
     }
 }
 
-void WifiManage::onHide(TT_UNUSED AppContext& app) {
+void WifiManage::onHide(AppContext& app) {
     lock();
     service::wifi::getPubsub()->unsubscribe(wifiSubscription);
     wifiSubscription = nullptr;