## New features
- Implemented support for app packaging in firmware and `tactility.py`: load `.app` files instead of `.elf` files. Install apps remotely or via `FileBrowser`.
- Ensure headless mode works: all services that require LVGL can deal with the absence of a display
- Service `onStart()` is now allowed to fail (return `bool` result)
- Added and improved various file-related helper functions
## Improvements
- Completely revamped the SystemInfo app UI
- Improved Calculator UI of internal and external variant
- Fix Chat UI and removed the emoji buttons for now
- Fix for toolbar bottom padding issue in all apps
## Fixes
- Fix for allowing recursive locking for certain SPI SD cards
& more
- Fix bug in Development app: when launching/stopping external app due to LVGL being stopped and a timer still being active (sometimes, as it's a race condition)
- Added TODO to fix the same bug in other apps
- Update external app SDKs to `0.5.0-SNAPSHOT`
- Disable `DisplayDriver` for `St7701Display` (on CYD 4848)
- Improve `GraphicsDemo`: check for feature capability and show alert dialog if there's an issue
- `DevelopmentService` installs to `/data` instead of `/sdcard`
- Fixed `tt_app_get_data_directory()` and `tt_app_get_data_directory_lvgl()` (C++ to C)
- `tt_kernel.h` now defines `MAX_TICKS`
- `tt_init.cpp` now exports `esp_log()` which is required since ESP-IDF 5.5
- `DisplayDevice` improvements related `DisplayDriver`
- Replaced incorrect usage of `spiBusHandle` with `spiHostDevice` in all SPI display devices
- Disabled `DisplayDriver` support for RGB displays for now
- Updated `GraphicsDemo` project for the above changes
- TactilityC improvements:
- created `tt_hal_device_find()`
- created `tt_hal_display_*`
- created `tt_hal_touch_*`
- created `tt_lvgl_*`
- export `tt_app_*` calls
