chore: ignore desktop binary distribution artifacts

Untrack the 461MB packages/desktop/fusion-desktop-0.31.0.tgz and broaden
.gitignore to cover desktop packager outputs (.tgz, .zip, .pkg, .msi,
.deb, .rpm, .snap, .blockmap, latest*.yml, builder-debug.yml) so future
electron-builder/pnpm-pack output is not committed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

@@ -14,10 +14,22 @@ dist-electron/
 # Desktop packaging artifacts
 *.dmg
 *.dmg.blockmap
+*.zip
 *.zip.blockmap
 *.AppImage
 *.exe
 *.nupkg
+*.tgz
+*.tar.gz
+*.pkg
+*.msi
+*.deb
+*.rpm
+*.snap
+*.blockmap
+latest*.yml
+builder-debug.yml
+builder-effective-config.yaml
 
 # Coverage reports
 coverage/