chore(packaging): canonical icons, desktop file, and nfpm config

Icons and qbz.desktop move to packaging/ so packagers stop depending
on the retired src-tauri tree. New nfpm.yaml builds deb/rpm from the
prebuilt binary: deps are the measured ldd set (t64 alternatives on
deb, soname requires on rpm), display/GPU stack as recommends.

cc

packaging/icons/README.md

@@ -0,0 +1,11 @@
+# Canonical app icons
+
+Canonical icon source for every Linux/macOS packager (nfpm deb/rpm, AppImage,
+tarball, flatpak, snap, ebuilds, PKGBUILDs). Copied out of `src-tauri/icons/`
+on 2026-07-02 so packaging stops depending on the retired Tauri tree —
+`src-tauri/` is reference-only and will eventually be deleted.
+
+- `NNxNN.png` — hicolor sizes (32/48/64/128/256/512, plus `128x128@2x`)
+- `icon.icns` — macOS bundle icon
+
+If the artwork ever changes, update BOTH copies (or delete the src-tauri one).

packaging/linux/qbz.desktop

@@ -0,0 +1,12 @@
+[Desktop Entry]
+Name=QBZ
+Comment=Native Qobuz client with hi-res audio support
+Exec=qbz %u
+Icon=qbz
+Terminal=false
+Type=Application
+Categories=AudioVideo;Audio;Music;Player;
+Keywords=music;audio;qobuz;hifi;streaming;audiophile;flac;
+StartupWMClass=com.blitzfc.qbz
+StartupNotify=true
+MimeType=x-scheme-handler/qbz;x-scheme-handler/qobuzapp;

packaging/nfpm/nfpm.yaml

@@ -0,0 +1,92 @@
+# nfpm config — builds .deb and .rpm from the prebuilt Slint binary.
+# Used by release-linux(.yml/-aarch64.yml): nfpm package -f this-file -p deb|rpm
+#
+# Interpolated env (exported by the workflow):
+#   QBZ_VERSION  release version without the v prefix (e.g. 2.0.0)
+#   QBZ_ARCH     deb-style arch: amd64 | arm64
+#   QBZ_BINARY   path to the stripped release binary (crates/target/.../qbz)
+#
+# Runtime deps are the MEASURED `ldd` set of the Slint binary (2026-07-02):
+# alsa, fontconfig, freetype, png16, bz2, expat, zlib. The wayland/x11/GL/
+# dbus/xkbcommon stack is dlopen'd by winit/glutin/wgpu at runtime, so it
+# goes in Recommends — missing pieces degrade (e.g. X11 fallback) instead of
+# blocking install on unusual setups.
+
+name: qbz
+arch: ${QBZ_ARCH}
+platform: linux
+version: ${QBZ_VERSION}
+section: sound
+priority: optional
+maintainer: Victor Rodriguez <vicrodh@users.noreply.github.com>
+description: |
+  Native Qobuz client with hi-res audio support.
+  Bit-perfect playback, DAC passthrough, offline cache, local library.
+vendor: QBZ
+homepage: https://github.com/vicrodh/qbz
+license: MIT
+
+contents:
+  - src: ${QBZ_BINARY}
+    dst: /usr/bin/qbz
+    file_info:
+      mode: 0755
+  - src: packaging/linux/qbz.desktop
+    dst: /usr/share/applications/qbz.desktop
+  - src: packaging/flatpak/com.blitzfc.qbz.metainfo.xml
+    dst: /usr/share/metainfo/com.blitzfc.qbz.metainfo.xml
+  - src: packaging/icons/32x32.png
+    dst: /usr/share/icons/hicolor/32x32/apps/qbz.png
+  - src: packaging/icons/48x48.png
+    dst: /usr/share/icons/hicolor/48x48/apps/qbz.png
+  - src: packaging/icons/64x64.png
+    dst: /usr/share/icons/hicolor/64x64/apps/qbz.png
+  - src: packaging/icons/128x128.png
+    dst: /usr/share/icons/hicolor/128x128/apps/qbz.png
+  - src: packaging/icons/256x256.png
+    dst: /usr/share/icons/hicolor/256x256/apps/qbz.png
+  - src: packaging/icons/512x512.png
+    dst: /usr/share/icons/hicolor/512x512/apps/qbz.png
+
+overrides:
+  deb:
+    depends:
+      # t64 alternatives cover Ubuntu 24.04+'s time_t64 renames.
+      - libasound2 | libasound2t64
+      - libfontconfig1
+      - libfreetype6
+      - libpng16-16 | libpng16-16t64
+      - libbz2-1.0
+      - libexpat1
+      - zlib1g
+    recommends:
+      - libwayland-client0
+      - libxkbcommon0
+      - libegl1
+      - libgl1
+      - libdbus-1-3
+      - libxcb1
+      - pipewire
+  rpm:
+    depends:
+      # Soname-level requires survive package renames across Fedora/openSUSE
+      # (e.g. zlib -> zlib-ng-compat) — every distro Provides the soname.
+      - libasound.so.2()(64bit)
+      - libfontconfig.so.1()(64bit)
+      - libfreetype.so.6()(64bit)
+      - libpng16.so.16()(64bit)
+      - libbz2.so.1()(64bit)
+      - libexpat.so.1()(64bit)
+      - libz.so.1()(64bit)
+    recommends:
+      - libxkbcommon
+      - libwayland-client
+      - dbus-libs
+      - pipewire
+
+rpm:
+  group: Applications/Multimedia
+  compression: zstd
+
+deb:
+  compression: zstd