chore(packaging): unify .desktop files across all formats

- Add flac; keyword to all .desktop files (was only in deb template)
- Add StartupNotify=true to flatpak .desktop files (was missing)
- Add Keywords line to snap .desktop (was missing entirely)
- Unify shortDescription to match other .desktop Comment fields

cc

.github/workflows/release-linux.yml

@@ -135,7 +135,7 @@ jobs:
           Terminal=false
           Type=Application
           Categories=AudioVideo;Audio;Music;Player;
-          Keywords=music;audio;qobuz;hifi;streaming;audiophile;
+          Keywords=music;audio;qobuz;hifi;streaming;audiophile;flac;
           StartupWMClass=com.blitzfc.qbz
           StartupNotify=true
           MimeType=x-scheme-handler/qbz;x-scheme-handler/qobuzapp;

flatpak/com.blitzfc.qbz.desktop

@@ -7,5 +7,6 @@ Icon=com.blitzfc.qbz
 Categories=AudioVideo;Audio;Music;Player;
 Terminal=false
 StartupWMClass=com.blitzfc.qbz
-Keywords=music;audio;qobuz;hifi;streaming;audiophile;
+StartupNotify=true
+Keywords=music;audio;qobuz;hifi;streaming;audiophile;flac;
 MimeType=x-scheme-handler/qbz;x-scheme-handler/qobuzapp;

packaging/arch/qbz.desktop

@@ -8,5 +8,5 @@ Categories=AudioVideo;Audio;Music;Player;
 Terminal=false
 StartupWMClass=com.blitzfc.qbz
 StartupNotify=true
-Keywords=music;audio;qobuz;hifi;streaming;audiophile;
+Keywords=music;audio;qobuz;hifi;streaming;audiophile;flac;
 MimeType=x-scheme-handler/qbz;x-scheme-handler/qobuzapp;

packaging/aur/qbz.desktop

@@ -8,5 +8,5 @@ Categories=AudioVideo;Audio;Music;Player;
 Terminal=false
 StartupWMClass=com.blitzfc.qbz
 StartupNotify=true
-Keywords=music;audio;qobuz;hifi;streaming;audiophile;
+Keywords=music;audio;qobuz;hifi;streaming;audiophile;flac;
 MimeType=x-scheme-handler/qbz;x-scheme-handler/qobuzapp;

packaging/flatpak/com.blitzfc.qbz.desktop

@@ -7,5 +7,6 @@ Icon=com.blitzfc.qbz
 Categories=AudioVideo;Audio;Music;Player;
 Terminal=false
 StartupWMClass=com.blitzfc.qbz
-Keywords=music;audio;qobuz;hifi;streaming;audiophile;
+StartupNotify=true
+Keywords=music;audio;qobuz;hifi;streaming;audiophile;flac;
 MimeType=x-scheme-handler/qbz;x-scheme-handler/qobuzapp;

packaging/snap/snap/gui/qbz.desktop

@@ -8,4 +8,5 @@ Categories=AudioVideo;Audio;Music;Player;
 Terminal=false
 StartupWMClass=com.blitzfc.qbz
 StartupNotify=true
+Keywords=music;audio;qobuz;hifi;streaming;audiophile;flac;
 MimeType=x-scheme-handler/qbz;x-scheme-handler/qobuzapp;

src-tauri/tauri.conf.json

@@ -41,7 +41,7 @@
       "icons/icon.ico"
     ],
     "category": "Music",
-    "shortDescription": "Native high-fidelity client for Qobuz\u2122 subscribers on Linux",
+    "shortDescription": "Native Qobuz client with hi-res audio support",
     "longDescription": "QBZ is a native high-fidelity client for Qobuz\u2122 subscribers on Linux, designed for audiophiles who need bit-perfect playback without browser sample rate limitations. This application uses the Qobuz API but is not certified by Qobuz.",
     "linux": {
       "deb": {