feat: new app icon, AUR package, remove AppImage (v1.4.4)

- New app icon across all platforms
- AUR package: Arch/CachyOS users can install via yay/paru
- AppImage removed: incompatible with non-Ubuntu distros due to
  bundled WebKitGTK vs system Mesa/EGL conflicts
- CI: build only deb+rpm for Linux, drop GStreamer/linuxdeploy deps

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

packages/aur/.gitignore

@@ -0,0 +1,4 @@
+src/
+pkg/
+*.tar.zst
+*.tar.gz

packages/aur/PKGBUILD

@@ -0,0 +1,65 @@
+# Maintainer: stelle <stelle@psychotoxical.dev>
+pkgname=psysonic
+pkgver=1.4.3
+pkgrel=1
+pkgdesc="Desktop music player for Subsonic API-compatible servers (Navidrome, Gonic, etc.)"
+arch=('x86_64')
+url="https://github.com/Psychotoxical/psysonic"
+license=('GPL-3.0-only')
+depends=(
+  'webkit2gtk-4.1'
+  'gtk3'
+  'libayatana-appindicator'
+  'openssl'
+  'alsa-lib'
+)
+makedepends=(
+  'npm'
+  'rust'
+  'cargo'
+)
+source=("$pkgname-$pkgver.tar.gz::https://github.com/Psychotoxical/psysonic/archive/refs/tags/app-v$pkgver.tar.gz")
+sha256sums=('SKIP')
+
+build() {
+  cd "psysonic-app-v$pkgver"
+
+  export CARGO_HOME="$srcdir/cargo-home"
+  export npm_config_cache="$srcdir/npm-cache"
+
+  npm install
+  npm run tauri:build -- --no-bundle
+}
+
+package() {
+  cd "psysonic-app-v$pkgver"
+
+  # Binary (in /usr/lib to make room for the wrapper)
+  install -Dm755 "src-tauri/target/release/psysonic" "$pkgdir/usr/lib/psysonic/psysonic"
+
+  # Wrapper script that sets necessary env vars for WebKitGTK on Wayland
+  install -Dm755 /dev/stdin "$pkgdir/usr/bin/psysonic" <<EOF
+#!/bin/sh
+export GDK_BACKEND=x11
+export WEBKIT_DISABLE_COMPOSITING_MODE=1
+export WEBKIT_DISABLE_DMABUF_RENDERER=1
+exec /usr/lib/psysonic/psysonic "\$@"
+EOF
+
+  # Desktop entry
+  install -Dm644 /dev/stdin "$pkgdir/usr/share/applications/psysonic.desktop" <<EOF
+[Desktop Entry]
+Name=Psysonic
+Comment=Desktop music player for Subsonic API-compatible servers
+Exec=psysonic
+Icon=psysonic
+Terminal=false
+Type=Application
+Categories=AudioVideo;Audio;Music;Player;
+EOF
+
+  # Icons
+  install -Dm644 "src-tauri/icons/32x32.png"      "$pkgdir/usr/share/icons/hicolor/32x32/apps/psysonic.png"
+  install -Dm644 "src-tauri/icons/128x128.png"    "$pkgdir/usr/share/icons/hicolor/128x128/apps/psysonic.png"
+  install -Dm644 "src-tauri/icons/128x128@2x.png" "$pkgdir/usr/share/icons/hicolor/256x256/apps/psysonic.png"
+}