FLIPPIX OS v0.2.1-alpha — Menu and Safe Reboot

Minimal UI and safe-power microrelease for Flipper Zero.

Changes:

• native startup Main Menu: Console, Settings, System info, and Power
• adjustable LCD backlight
• confirmed Reboot, USB flash (ROM DFU), and Halt actions
• safe OK/BOOT0 release handling before reset
• menu navigation no longer inherits held-button repeat
• menu-driven USB firmware updates without ST-Link
• fixed build rule that now always regenerates fuzix.bin
• modern GNU Arm Thumb metadata fix for switchin

Hardware-tested on a physical Flipper Zero, including clean reboot, menu-driven
ROM DFU, USB erase/download, CDC return, display, buttons, and read-write SD.

Source revision: aifadetri/FLIPPIX@8f61801

This remains experimental alpha firmware. Keep qFlipper available for stock
firmware recovery.