fix: use --publish never + manual upload for macOS x64 build

electron-builder's publisher tries to manage ALL release assets during
upload, causing 422 conflicts when arm64 assets already exist. x64 now
builds with --publish never and manually uploads only its own artifacts.

.github/workflows/release.yml

@@ -145,25 +145,25 @@ jobs:
         working-directory: packages/electron
         run: node electron/prepare-pack.mjs
 
-      - name: Clean stale release assets
-        continue-on-error: true
+      - name: Pack (mac-x64)
+        working-directory: packages/electron
+        run: npx electron-builder --config electron-builder.yml --mac --x64 --publish never
+
+      - name: Upload x64 artifacts to release
         run: |
           TAG="${{ inputs.tag || github.ref_name }}"
-          ASSETS=$(gh release view "$TAG" --json assets -q '.assets[].name' 2>/dev/null || echo "")
-          [ -z "$ASSETS" ] && exit 0
-          echo "$ASSETS" | grep -iE "x64" | while read -r name; do
-            echo "Removing stale asset: $name"
-            gh release delete-asset "$TAG" "$name" -y 2>/dev/null || true
+          cd packages/electron/release
+          for f in *; do
+            [ -f "$f" ] || continue
+            # Skip arm64 files and yml manifests (arm64 build already uploaded these)
+            echo "$f" | grep -qi "arm64" && continue
+            echo "$f" | grep -qiE "\.yml$" && continue
+            echo "Uploading: $f"
+            gh release upload "$TAG" "$f" --clobber 2>/dev/null || true
           done
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Pack (mac-x64)
-        working-directory: packages/electron
-        run: npx electron-builder --config electron-builder.yml --mac --x64 --publish always
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-
   release:
     needs: [build, build-mac-x64]
     runs-on: ubuntu-latest