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.

Devices/m5stack-cardputer-adv/Source/devices/SdCard.cpp

@@ -3,6 +3,7 @@
 #include <Tactility/hal/sdcard/SpiSdCardDevice.h>
 
 constexpr auto SDCARD_PIN_CS = GPIO_NUM_12;
+constexpr auto EXPANSION_HEADER_PIN_CS = GPIO_NUM_5;
 
 using tt::hal::sdcard::SpiSdCardDevice;
 
@@ -14,7 +15,7 @@ std::shared_ptr<SdCardDevice> createSdCard() {
         GPIO_NUM_NC,
         SdCardDevice::MountBehaviour::AtBoot,
         tt::hal::spi::getLock(SPI3_HOST),
-        std::vector<gpio_num_t>(),
+        std::vector { EXPANSION_HEADER_PIN_CS },
         SPI3_HOST
     );