fix: skip Windows code signing when WIN_CSC_LINK secret is absent

- Remove hardcoded certificateFile/certificatePassword from package.json win config
- Add publisherName: "NetCopilot" so electron-builder doesn't need to extract it from a cert
- electron-builder gracefully skips signing when WIN_CSC_LINK env var is empty

Author: AnasProgrammer2

.github/workflows/release.yml

@@ -91,7 +91,7 @@ jobs:
           APPLE_ID:                    ${{ secrets.APPLE_ID }}
           APPLE_APP_SPECIFIC_PASSWORD: ${{ secrets.APPLE_APP_SPECIFIC_PASSWORD }}
           CSC_IDENTITY_AUTO_DISCOVERY: ${{ secrets.APPLE_CERTIFICATE != '' && 'true' || 'false' }}
-          # Windows signing (no-op if secrets absent)
+          # Windows signing — skipped automatically when secrets are absent
           WIN_CSC_LINK:         ${{ secrets.WIN_CSC_LINK }}
           WIN_CSC_KEY_PASSWORD: ${{ secrets.WIN_CSC_KEY_PASSWORD }}
           # GitHub token for electron-updater publish

package.json

@@ -116,8 +116,7 @@
         "portable"
       ],
       "icon": "resources/icon.ico",
-      "certificateFile": "${WIN_CSC_LINK}",
-      "certificatePassword": "${WIN_CSC_KEY_PASSWORD}"
+      "publisherName": "NetCopilot"
     },
     "linux": {
       "target": [