fix(ci): use POSIX-compatible case statement for tag detection

The Gitea runner uses sh, not bash — [[ ]] syntax fails silently
causing all pushes to publish as snapshots instead of tagged releases.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/publish.yml

@@ -23,17 +23,21 @@ jobs:
         run: npm run build:lib
 
       - name: Publish package
+        shell: bash
         run: |
-          if [[ "$GITHUB_REF" == refs/tags/v* ]]; then
-            VERSION="${GITHUB_REF_NAME#v}"
-            npm version "$VERSION" --no-git-tag-version
-            TAG="latest"
-          else
-            SHORT_SHA=$(echo "$GITHUB_SHA" | head -c 7)
-            DATE=$(date +%Y%m%d)
-            npm version "0.0.0-snapshot.${DATE}.${SHORT_SHA}" --no-git-tag-version
-            TAG="dev"
-          fi
+          case "$GITHUB_REF" in
+            refs/tags/v*)
+              VERSION="${GITHUB_REF_NAME#v}"
+              npm version "$VERSION" --no-git-tag-version
+              TAG="latest"
+              ;;
+            *)
+              SHORT_SHA=$(echo "$GITHUB_SHA" | head -c 7)
+              DATE=$(date +%Y%m%d)
+              npm version "0.0.0-snapshot.${DATE}.${SHORT_SHA}" --no-git-tag-version
+              TAG="dev"
+              ;;
+          esac
           echo '@cameleer:registry=https://gitea.siegeln.net/api/packages/cameleer/npm/' > .npmrc
           echo '//gitea.siegeln.net/api/packages/cameleer/npm/:_authToken=${{ secrets.REGISTRY_TOKEN }}' >> .npmrc
           npm publish --tag "$TAG"