Minimal Kernel Manager

Added a Discord community card in Settings to join MKM users and developers. Added a Quick Access grid on the Home page for one-tap navigation to CPU, GPU, RAM, Storage, Power, Battery, Overlay, and Settings; locked items show a lock badge and require root or Shizuku. Added overlay appearance options to show absolute values (GB / MHz) for CPU, GPU, RAM, and SWAP with per-metric toggles. Added an overlay CPU Frequency display mode: All Cores, Average, or Max Frequency. Added an overlay accent col