Harden BLE host link and expose latency tools in the dashboard.

Add BLE RTT/stream tests and live tick median in the UI, fix concurrent WebSocket writes and late BATTERY replies, and skip 2M PHY updates that assert under ESP-NOW coexistence.

Co-authored-by: Cursor <cursoragent@cursor.com>

goTool/cache_status.go

@@ -57,6 +57,14 @@ func tapEventsFromCacheStatus(r *pb.CacheStatusResponse) []*pb.TapEvent {
 // cacheStatusFromBLEStreamPayload parses a framed BLE_STREAM_TICK payload
 // (type byte + protobuf UartMessage) into a CacheStatusResponse-shaped view.
 func cacheStatusFromBLEStreamPayload(payload []byte) (*pb.CacheStatusResponse, error) {
+	tick, err := parseBleStreamTickPayload(payload)
+	if err != nil {
+		return nil, err
+	}
+	return &pb.CacheStatusResponse{Clients: tick.GetClients()}, nil
+}
+
+func parseBleStreamTickPayload(payload []byte) (*pb.BleStreamTick, error) {
 	if len(payload) < 2 {
 		return nil, fmt.Errorf("BLE stream tick too short")
 	}
@@ -71,5 +79,5 @@ func cacheStatusFromBLEStreamPayload(payload []byte) (*pb.CacheStatusResponse, e
 	if tick == nil {
 		return nil, fmt.Errorf("missing ble_stream_tick")
 	}
-	return &pb.CacheStatusResponse{Clients: tick.GetClients()}, nil
+	return tick, nil
 }