Add winkel

[DouglasdeMoura]

Summary

Adds winkel, a metronome built for Omarchy. It follows the live Omarchy
theme, like Flea, and runs on Quickshell with a small Rust audio backend.

• Sample-accurate clicks, tempo from 10 to 400 BPM, tap tempo and the
  classical tempo marking.
• A time signature editor, per-beat accents, and subdivisions shown in
  musical notation, from triplets and dotted rhythms to sextuplets.
• Fully keyboard driven, with a keys sheet on ?.
• Keeps Bluetooth earbuds awake so no tick is swallowed.

The name honours Dietrich Nikolaus Winkel, who invented the mechanical
metronome in 1814.

• Source: https://github.com/DouglasdeMoura/winkel (MIT)
• Release: https://github.com/DouglasdeMoura/winkel/releases/tag/v0.1.0
• I'm the author and maintainer.

Package

• Builds from the v0.1.0 source tarball with cargo --frozen, runs the
  test suite in check(), and installs through the project's
  make install PREFIX=/usr.
• Depends on quickshell, alsa-lib, gcc-libs, glibc and
  hicolor-icon-theme; the default font is an optional dependency.
• Installs /usr/bin/winkel, /usr/share/winkel/ui, a desktop entry,
  icon and AppStream metainfo named after the app id
  dev.douglasmoura.winkel, and the MIT licences.
• .omarchy/package.json watches the GitHub releases, in the fast ring with
  a 24-hour min_release_age, the same shape as Flea.

Testing

• makepkg of this recipe on x86_64: checksum validated, built, tests passed
  (46 Rust tests plus the protocol test), packaged.
• The project's release workflow builds and publishes x86_64 and aarch64
  binaries; the aarch64 build of this recipe was not run locally.