feat: app icon + Arch package (PKGBUILD + .desktop)

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>

packaging/PKGBUILD

@@ -0,0 +1,68 @@
+# Maintainer: mollusk <jitty+lc1iz0dc@protonmail.com>
+pkgname=peerspeak-git
+_pkgname=peerspeak
+pkgver=0.1.0
+pkgrel=1
+pkgdesc="Decentralized peer-to-peer voice chat (Rust/iroh/PipeWire/Opus/iced)"
+arch=('x86_64')
+url="https://gitbutter.xyz/mollusk/peerspeak"
+license=('custom')
+depends=('pipewire' 'opus')
+makedepends=('git' 'cargo' 'pkgconf')
+optdepends=('pixelpass: screen sharing inside a room'
+            'mpv: screen-share viewer (vlc is used as a fallback)')
+provides=('peerspeak')
+conflicts=('peerspeak')
+options=('!lto' '!debug')
+source=("$_pkgname::git+ssh://git@gitbutter.xyz/mollusk/peerspeak.git")
+sha256sums=('SKIP')
+
+pkgver() {
+  cd "$srcdir/$_pkgname"
+  # 0.1.0.r<commits>.g<short-sha> — sorts monotonically across rebuilds.
+  printf '%s.r%s.g%s' \
+    "$(awk -F'\"' '/^version =/{print $2; exit}' Cargo.toml)" \
+    "$(git rev-list --count HEAD)" \
+    "$(git rev-parse --short HEAD)"
+}
+
+prepare() {
+  cd "$srcdir/$_pkgname"
+  # Vendor deps up front so build() can run --frozen (no surprise network).
+  export CARGO_HOME="$srcdir/cargo-home"
+  cargo fetch --locked --target "$(rustc -vV | sed -n 's/host: //p')"
+}
+
+build() {
+  cd "$srcdir/$_pkgname"
+  export CARGO_HOME="$srcdir/cargo-home"
+  export RUSTUP_TOOLCHAIN=stable
+  export CARGO_TARGET_DIR=target
+  cargo build --frozen --release --bin "$_pkgname"
+}
+
+check() {
+  cd "$srcdir/$_pkgname"
+  export CARGO_HOME="$srcdir/cargo-home"
+  export RUSTUP_TOOLCHAIN=stable
+  # Library unit tests only — the integration suites bind real iroh/QUIC
+  # endpoints and fail in a sandboxed/offline build environment.
+  cargo test --frozen --release --lib
+}
+
+package() {
+  cd "$srcdir/$_pkgname"
+
+  install -Dm755 "target/release/$_pkgname" "$pkgdir/usr/bin/$_pkgname"
+  install -Dm644 "packaging/$_pkgname.desktop" \
+    "$pkgdir/usr/share/applications/$_pkgname.desktop"
+
+  # Hicolor icon theme (scalable SVG + the rendered raster sizes).
+  install -Dm644 "assets/icons/$_pkgname.svg" \
+    "$pkgdir/usr/share/icons/hicolor/scalable/apps/$_pkgname.svg"
+  local s
+  for s in 16 24 32 48 64 128 256 512; do
+    install -Dm644 "assets/icons/$_pkgname-$s.png" \
+      "$pkgdir/usr/share/icons/hicolor/${s}x${s}/apps/$_pkgname.png"
+  done
+}

packaging/peerspeak.desktop

@@ -0,0 +1,11 @@
+[Desktop Entry]
+Type=Application
+Name=PeerSpeak
+GenericName=P2P Voice Chat
+Comment=Decentralized peer-to-peer voice chat
+Exec=peerspeak
+Icon=peerspeak
+Terminal=false
+Categories=Network;Telephony;Chat;
+Keywords=voice;chat;voip;p2p;peer;
+StartupWMClass=peerspeak