Add a desktop/taskbar identity and a system package for PeerSpeak.
- assets/icons/peerspeak.svg: master app icon — the in-app mic glyph
over a P2P mesh of peer nodes, Catppuccin Mocha palette. Rendered to
the hicolor raster sizes (16..512) committed alongside it.
- Window/taskbar icon: embed a 128x128 straight-RGBA blob and load it
via iced from_rgba (keeps us off iced's heavy `image` feature). Set
the Wayland/X11 app_id to "peerspeak" so compositors match the window
to the .desktop launcher and show the icon natively.
- packaging/peerspeak.desktop: launcher (StartupWMClass=peerspeak).
- packaging/PKGBUILD: peerspeak-git VCS package — cargo --frozen build,
--lib check, installs the binary, .desktop, and hicolor icons.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>