chore: streamline legacy artifact renaming in GitHub Actions workflow

- Replaced inline script for renaming legacy artifacts with a dedicated script call to `rename_legacy_artifacts.sh` for improved maintainability and clarity.

.github/workflows/build.yml

@@ -221,17 +221,7 @@ jobs:
           matrix.variant == 'legacy' &&
           (github.event_name == 'push' ||
           (github.event_name == 'workflow_dispatch' && inputs[matrix.build_input] == true))
-        shell: bash
-        run: |
-          shopt -s nullglob
-          for f in dist/*-win-installer.exe dist/*-win-portable.exe dist/*-linux.AppImage dist/*-linux.deb; do
-            [ -e "$f" ] || continue
-            dir=$(dirname "$f")
-            base=$(basename "$f")
-            ext="${base##*.}"
-            name="${base%.$ext}"
-            mv "$f" "$dir/${name}-legacy.${ext}"
-          done
+        run: ./scripts/rename_legacy_artifacts.sh
 
       - name: Upload build artifacts
         if: |