Satur8 v0.3.2

Hyprland linear-light release.

• Make satur8 set --linear apply before the Hyprland shader is written, so
  the requested linear-light mode affects the current command.
• Add a Hyprland linear-light shader path using the standard sRGB transfer
  functions instead of a simple gamma approximation.
• Keep the default Hyprland gamma-encoded shader path unchanged unless
  --linear is requested.
• Verify on AMD RX 9070 / Hyprland 0.55.4 that linear-light output differs from
  the gamma path as expected.