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/network/Http.cpp

@@ -3,6 +3,8 @@
 #include <Tactility/Logger.h>
 #include <Tactility/network/Http.h>
 
+#include "Tactility/service/gui/GuiService.h"
+
 #ifdef ESP_PLATFORM
 #include <Tactility/network/EspHttpClient.h>
 #include <esp_http_client.h>
@@ -19,7 +21,8 @@ void download(
     const std::function<void()>& onSuccess,
     const std::function<void(const char* errorMessage)>& onError
 ) {
-    LOGGER.info("Downloading {} to {}", url, downloadFilePath);
+    service::gui::warnIfRunningOnGuiTask("HTTP");
+    LOGGER.info("Downloading from {} to {}", url, downloadFilePath);
 #ifdef ESP_PLATFORM
     getMainDispatcher().dispatch([url, certFilePath, downloadFilePath, onSuccess, onError] {
         LOGGER.info("Loading certificate");
@@ -90,6 +93,7 @@ void download(
                 onError("Failed to write all bytes");
                 return;
             }
+            taskYIELD();
         }
         fclose(file);
         LOGGER.info("Downloaded {} to {}", url, downloadFilePath);