feat: add RGB controls with fake suspend integration

[antnyhills]

This PR adds RGB configuration controls to the Armada Control Decky plugin and the fake-suspend script.

Key Features

• Enhanced RGB UI: Adds an "RGB Settings" tab featuring:
  • Quick Color Presets: 9 curated preset color buttons (Red, Orange, Yellow, Green, Cyan, Blue, Purple, Magenta, White) for fast selection.
  • Normalized LED Color Preview: Real-time visual preview displaying the pure color hue without black pigmenting, accurately representing physical LED output.
  • Advanced Controls: Expandable raw RGB sliders (R, G, B) to keep the default view clean while allowing fine-tuning.
  • Zone Sync & Brightness: Dedicated brightness slider and option to sync left and right LED zones.
• Hardware-Agnostic Discovery: Dynamically scans /sys/class/leds/ at runtime. Automatically detects and supports both:
  • Unified Linux multicolor framework nodes (multicolor:left, multicolor:right)
  • Individual single-channel LED node layouts (e.g., l:r1, l:g1, l:b1 on AYN Odin 2 / Thor / Odin 3), grouping multi-LED channels per side into unified Left and Right zones.
• Graceful Fallbacks: If a device lacks RGB hardware or standard sysfs entries, the discovery system returns empty and ignores write calls without throwing errors or crashing the plugin.
• Fake-Suspend Integration: Updates fake-suspend to dynamically detect and turn off all active RGB/joystick LEDs upon entering fake suspend, and cleanly restores their previous states on wake.

Testing

• Verified working on AYN Odin 3 (SM8750) using single-channel controls.
• Untested on any other device.

[antnyhills]

Here is a cleaned up and updated pull request. This includes a better layout for the RGB selection and fixes for better reliability.