v0.8.0

[0.8.0] - 2026-08-25

Added

• Linux GPU support (NVIDIA via NVML, AMD and Intel via the DRM sysfs
  interface) and Linux fan speed via the hwmon sysfs interface.
• Battery cycle count and health percentage in the sensors panel (where the
  platform exposes them).

Changed

• GPU panel title shows the vendor name (Apple, AMD/Intel, NVIDIA, …) instead
  of a generic "GPU".
• Removed unused snapshot fields and marked test-only ring-buffer helpers as
  #[cfg(test)].
• macOS-only dependencies (core-foundation, smc-lib) are now target-gated
  so the crate builds on Linux and Windows.