TODOs

Create more unit tests for tactility-core and tactility (PC-only for now)
Have a way to deinit LVGL drivers that are created from HardwareConfig
Show a warning screen if firmware encryption or secure boot are off when saving WiFi credentials.
Show a warning screen when a user plugs in the SD card on a device that only supports mounting at boot.
Try out Waveshare S3 120MHz mode for PSRAM (see "enabling 120M PSRAM is necessary" in docs)
T-Deck has random sdcard SPI crashes due to sharing bus with screen SPI: make it use the LVGL lock for sdcard operations?
Check service/app id on registration to see if it is a duplicate id
Fix screenshot app on ESP32: it currently blocks when allocating memory
Localisation of texts
Portrait support for GPIO app
App lifecycle docs mention on_create/on_destroy but app lifecycle is on_start/on_stop
Explore LVGL9's FreeRTOS functionality
Explore LVGL9's ILI93414 driver for 2.4" Yellow Board
Bug: in LVGL9 with M5Core2, crash when bottom item is clicked without scrolling first
Publish firmwares with upload tool
De-duplicate WiFi SSIDs.
Replace M5Unified and M5GFX with custom drivers (so we can fix the Core2 SD card mounting bug, and so we regain some firmware space)

Core Ideas

Support for displays with different DPI. Consider the layer-based system like on Android.
If present, use LED to show boot status
2 wire speaker support
tt::app::start() and similar functions as proxies for Loader app start/stop/etc.
App.setResult() for apps that need to return data to other apps (e.g. file selection)
Wi-Fi using dispatcher to dispatch its main functionality to the dedicated Wi-Fi CPU core (to avoid main loop hack)