fix: enable version bumping in manual release workflow

- Fix version-bump.js to actually update package.json version
- Add tag existence check to prevent duplicate tag errors
- Remove semantic-release dependency from version bumping

.github/workflows/manual-release.yaml

@@ -129,8 +129,13 @@ jobs:
 
       - name: Create and push tag
         run: |
-          git tag -a "v${{ steps.version.outputs.new_version }}" -m "Release v${{ steps.version.outputs.new_version }}"
-          git push origin "v${{ steps.version.outputs.new_version }}"
+          # Check if tag already exists
+          if git rev-parse "v${{ steps.version.outputs.new_version }}" >/dev/null 2>&1; then
+            echo "Tag v${{ steps.version.outputs.new_version }} already exists, skipping tag creation"
+          else
+            git tag -a "v${{ steps.version.outputs.new_version }}" -m "Release v${{ steps.version.outputs.new_version }}"
+            git push origin "v${{ steps.version.outputs.new_version }}"
+          fi
 
       - name: Push changes to main
         run: git push origin HEAD:main