fix(desktop): use explicit artifact name for Linux to prevent scoped-name conflicts

The scoped package name @getpaseo/desktop was leaking into the tar.gz
artifact name. GitHub sanitizes the / to . on upload, causing a name
mismatch that prevents electron-builder's overwrite logic from finding
the existing asset on rebuild.

packages/desktop/electron-builder.yml

@@ -29,6 +29,7 @@ mac:
 linux:
   category: Development
   icon: assets
+  artifactName: "Paseo-${version}-${arch}.${ext}"
   extraResources:
     - from: bin/paseo
       to: bin/paseo