- The `/system` FAT volume is removed. Its files are embedded in the firmware as generated C arrays.
- Default-size fonts are generated at build time and used from flash.
- The LVGL task and the Launcher run on PSRAM-preferred stacks. A new kernel `file_ops` API takes the file work off those threads.
- `MainDispatcher` is reimplemented as an on-demand task.
- More long-lived state is allocated with the PSRAM-preferring helpers.
- Other fixes and improvements
* **New Features**
* Added App Hub browsing with All, Installed, and Updates filters, plus options to install, remove, or update apps.
* Added an installation activity indicator in the status bar.
* Added a mesh command-line app for checking status and managing mesh settings and channels.
* Radio region settings now persist across restarts and are applied to radio devices.
* Added audio codec support for the LilyGo T-LoRa Pager.
* Settings screens now use icons for selection actions.
* **Improvements**
* App Hub displays cached catalog results while a refresh is in progress.
* System menu close controls receive focus automatically when no pointer is available.
