Bump to v1.4.0: tap-to-dismiss, docker restart detection, cleanup thread fix

Add /clear-all endpoint and wire it to the tap handler so tapping the
display dismisses active warnings/critical alerts. Fix docker detector
to track restart count deltas instead of relying on the transient
"restarting" state. Wrap cleanup thread in try/except so it can't die
silently and leave events stuck forever.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

aggregator.py

@@ -226,6 +226,17 @@ def post_event():
     return jsonify({"status": "ok", "current_state": state}), 200
 
 
+@app.route("/clear-all", methods=["POST"])
+def clear_all_events():
+    """Clear all active events."""
+    with events_lock:
+        count = len(active_events)
+        active_events.clear()
+
+    state = write_status()
+    return jsonify({"status": "cleared", "count": count, "current_state": state}), 200
+
+
 @app.route("/clear", methods=["POST"])
 def clear_event():
     """