Fix data version extraction

config.py

@@ -109,9 +109,16 @@ APP_NAME = "Heos"
 
 # The deployed commit, so the UI can tell when the Pi has moved on to a
 # newer version and reload itself -- iOS otherwise resumes a suspended
-# home-screen session without ever checking back with the server. Empty
-# when git isn't available; app.js treats that as "nothing to compare".
+# home-screen session without ever checking back with the server. The
+# Gitea deploy stamps VERSION at checkout time and ships it (the deployed
+# tree otherwise has no .git -- see .gitea/workflows/deploy.yml); a manual
+# git-clone install has no VERSION file, so it falls back to asking git
+# directly. Empty when neither is available; app.js treats that as
+# "nothing to compare".
 def _app_version() -> str:
+    version_file = Path(__file__).resolve().parent / "VERSION"
+    if version_file.exists():
+        return version_file.read_text().strip()
     try:
         result = subprocess.run(
             ["git", "rev-parse", "--short", "HEAD"],