Fix data version extraction

.gitea/workflows/deploy.yml

@@ -80,6 +80,12 @@ jobs:
       - name: Run tests
         run: .venv-ci/bin/python -m unittest discover -s tests -t . --verbose
 
+      # DEPLOY_PATH has no .git (see below), so this is the only chance to
+      # ask git for the commit. config.py's APP_VERSION reads it back, to
+      # tell a resumed iOS home-screen session its UI is stale.
+      - name: Stamp the deployed version
+        run: git rev-parse --short HEAD > VERSION
+
       # .venv, .env and config.json are excluded, so the
       # runtime, the stereo pair's learned membership, Spotify's
       # credentials, and your rooms/ports survive --delete untouched.