Per-program window app IDs so the dock matches desktop entries

Main.py

@@ -39,7 +39,7 @@ def _SetMenuEntry(Enabled: bool) -> None:
         "[Desktop Entry]\nType=Application\nName=SaraSuite\n"
         "Comment=Install, update and remove Sara programs\n"
         f"Exec={_AppImage}\nIcon={_MenuIcon}\nTerminal=false\n"
-        "Categories=System;\nStartupNotify=true\n"
+        f"Categories=System;\nStartupNotify=true\nStartupWMClass={AppName}\n"
     )
 
 
@@ -234,4 +234,7 @@ if __name__ == "__main__":
         from Cli import Run
 
         sys.exit(Run(sys.argv[1:]))
+    # The window's app ID, so the desktop matches it to SaraSuite.desktop
+    # (icon, name) instead of showing it as Flet's generic "com.appveyor.flet".
+    os.environ.setdefault("FLET_APP_ID", AppName)
     ft.run(Main, assets_dir=str(AssetsDir))