Various fixes and improvements (#177)

- Remove custom `ESP_TARGET` and use `ESP_PLATFORM` everywhere
- Add `Loader` service functionality to `tt::app::` namespace
- Make `Loader` `PubSub` usable by exposing the messages
- Add board type to crash log
- Don't show SD card in Files app when it's not mounted
- Set default SPI frequency for SD cards
- Move TT_VERSION to scope that works for sim too
- Log Tactility version and board on boot
- Rename "Yellow Board" to "CYD 2432S024C"

TactilityHeadless/Source/hal/SpiSdCard.cpp

@@ -74,7 +74,7 @@ bool SpiSdCard::mountInternal(const char* mountPoint) {
     // The following value is from T-Deck repo's UnitTest.ino project:
     // https://github.com/Xinyuan-LilyGO/T-Deck/blob/master/examples/UnitTest/UnitTest.ino
     // Observation: Using this automatically sets the bus to 20MHz
-    host.max_freq_khz = config->spiFrequency / 1000U;
+    host.max_freq_khz = config->spiFrequencyKhz;
     host.slot = config->spiHost;
 
     esp_err_t result = esp_vfs_fat_sdspi_mount(mountPoint, &host, &slot_config, &mount_config, &card);