fix: Update GitHub Actions to use electron-packager

- Replace electron-builder with electron-packager to avoid code signing issues
- Simplify build process
- Create ZIP archive for distribution

.github/workflows/build-desktop.yml

@@ -26,28 +26,26 @@ jobs:
       - name: Install dependencies
         run: npm ci
       
-      - name: Build with electron-builder
-        run: npm run build
-        env:
-          CSC_IDENTITY_AUTO_DISCOVERY: false
+      - name: Build with electron-packager
+        run: npx electron-packager . "Advanced-SMTP-Tester" --platform=win32 --arch=x64 --out=dist --overwrite
       
-      - name: Upload installer artifact
+      - name: Create ZIP archive
+        run: Compress-Archive -Path "dist\Advanced-SMTP-Tester-win32-x64" -DestinationPath "Advanced-SMTP-Tester-Windows.zip"
+      
+      - name: Upload artifact
         uses: actions/upload-artifact@v4
         with:
-          name: windows-installer
-          path: |
-            dist/*.exe
-            dist/*.zip
+          name: windows-desktop-app
+          path: Advanced-SMTP-Tester-Windows.zip
           retention-days: 30
       
       - name: Create Release (on tag)
         if: startsWith(github.ref, 'refs/tags/v')
         uses: softprops/action-gh-release@v1
         with:
-          files: |
-            dist/*.exe
-            dist/*.zip
+          files: Advanced-SMTP-Tester-Windows.zip
           draft: false
           prerelease: false
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+