perf(desktop): ship a .deb instead of an 80MB AppImage

Co-authored-by: Cursor <cursoragent@cursor.com>

packages/i18n/locales/en/auth.json

@@ -35,7 +35,7 @@
     "download": {
       "android": "Download APK",
       "windows": "Download for Windows",
-      "linux": "Download AppImage",
+      "linux": "Download .deb",
       "macos": "Download for macOS"
     },
     "version": "version {{version}}",
@@ -43,7 +43,7 @@
     "step_install": {
       "android": "Open the downloaded file. If Android asks, allow installs from this source.",
       "windows": "Run the installer and follow the steps. pipu will appear in the Start menu.",
-      "linux": "Make the file executable and open it. For a .deb, install the package.",
+      "linux": "Install the package: sudo apt install ./pipu-music-….deb. Needs WebKitGTK 4.1 and GStreamer.",
       "macos": "Open the disk image and drag pipu into Applications."
     },
     "step_server": "Launch pipu and enter the server address:",