ci(web-clipper): publish -rc tags as pre-releases

A web-clipper-v*-rc* tag (web-clipper-v1.2.0-rc1, -rc.2) now creates a
GitHub pre-release, so a test build for testers is not mistaken for a
store release. Other tags stay normal releases, still not marked as
latest.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Author: eliandoran

.github/workflows/web-clipper.yml

@@ -76,6 +76,7 @@ jobs:
         if: ${{ startsWith(github.ref, 'refs/tags/web-clipper-v') }}
         with:
           draft: false
+          prerelease: ${{ contains(github.ref, '-rc') }}
           fail_on_unmatched_files: true
           files: |
             apps/web-clipper/.output/*.zip