fix(ci): build only DMG for macOS to avoid blockmap hang

- Skip zip target, only build DMG
- Blockmap generation for universal+zip was hanging indefinitely
- DMG alone should complete faster

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/release.yml

@@ -48,7 +48,7 @@ jobs:
           APPLE_ID: ${{ secrets.APPLE_ID }}
           APPLE_APP_SPECIFIC_PASSWORD: ${{ secrets.APPLE_APP_SPECIFIC_PASSWORD }}
           APPLE_TEAM_ID: ${{ secrets.APPLE_TEAM_ID }}
-        run: npx electron-builder --mac --universal --publish never
+        run: npx electron-builder --mac --universal --publish never --config.mac.target=dmg
 
       - name: List built artifacts
         run: ls -la dist/
@@ -58,8 +58,6 @@ jobs:
           name: macos-builds
           path: |
             dist/*.dmg
-            dist/*.zip
-            dist/*.dmg.blockmap
             dist/latest-mac.yml
 
   build-linux: