fix: pass commit short hash as version to UI sidebar

Add VITE_APP_VERSION build arg to UI Dockerfile, pass short SHA from
CI docker build step. vite.config.ts truncates to 7 chars so both
CI build and Docker build produce consistent short hashes.

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

.gitea/workflows/ci.yml

@@ -53,7 +53,7 @@ jobs:
           npm run build
         env:
           REGISTRY_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
-          VITE_APP_VERSION: ${{ github.ref_name }}@${{ github.sha }}
+          VITE_APP_VERSION: ${{ github.sha }}
 
       - name: Build and Test
         run: mvn clean verify -DskipITs -U --batch-mode
@@ -112,9 +112,11 @@ jobs:
           for TAG in $IMAGE_TAGS; do
             TAGS="$TAGS -t gitea.siegeln.net/cameleer/cameleer3-server-ui:$TAG"
           done
+          SHORT_SHA=$(echo "${{ github.sha }}" | cut -c1-7)
           docker buildx build --platform linux/amd64 \
             -f ui/Dockerfile \
             --build-arg REGISTRY_TOKEN="$REGISTRY_TOKEN" \
+            --build-arg VITE_APP_VERSION="$SHORT_SHA" \
             $TAGS \
             --cache-from type=registry,ref=gitea.siegeln.net/cameleer/cameleer3-server-ui:buildcache \
             --cache-to type=registry,ref=gitea.siegeln.net/cameleer/cameleer3-server-ui:buildcache,mode=max \