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/service/wifi/WifiEsp.cpp

@@ -6,6 +6,7 @@
 
 #include <Tactility/service/wifi/Wifi.h>
 
+#include <Tactility/Check.h>
 #include <Tactility/EventGroup.h>
 #include <Tactility/Logger.h>
 #include <Tactility/LogMessages.h>
@@ -140,7 +141,7 @@ static std::shared_ptr<Wifi> wifi_singleton;
 std::shared_ptr<PubSub<WifiEvent>> getPubsub() {
     auto wifi = wifi_singleton;
     if (wifi == nullptr) {
-        tt_crash("Service not running");
+        check(false, "Service not running");
     }
 
     return wifi->pubsub;
@@ -472,7 +473,7 @@ static void dispatchAutoConnect(std::shared_ptr<Wifi> wifi) {
     }
 }
 
-static void eventHandler(TT_UNUSED void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
+static void eventHandler(void* arg, esp_event_base_t event_base, int32_t event_id, void* event_data) {
     auto wifi = wifi_singleton;
     if (wifi == nullptr) {
         LOGGER.error("eventHandler: no wifi instance");