FrameEye Helper for Linux: the same app as FrameEyeHelper.exe, plus a preview of the headset's Eye panel.

  FrameEyeHelper
      Double-click it (or run ./FrameEyeHelper). "Try the demo" on the first page walks through every
      step with a pretend headset. The "Open the Eye panel preview" button (Linux only) opens the
      in-headset Eye panel in a window.

  FrameEye-Panel-Preview/run-panel-preview.sh
      The same preview from a terminal. It runs the real frameeyeosc and its Eye panel, fed by a pretend
      Steam Frame. Space (or the button at the top) closes and opens the pretend dashboard; with it closed
      you see what the headset shows, like the eye fit's dot. --reset starts over with default settings.

Nothing here sends anything to VRChat: the preview's frameeyeosc runs in its own empty network, and its
settings live in a scratch folder ($XDG_RUNTIME_DIR/frameeye-preview) that is gone after logging out.
Needs SDL2, cairo, freetype and the Noto Sans CJK fonts (all standard on Fedora).
