Add reconnectDelay variable for WebSocket reconnection logic

web/client/src/store/inventoryStore.js

@@ -29,6 +29,7 @@ function newCommandId() {
 let _httpPollTimer = null;
 let _wsHealthTimer = null;
 let _lastWsMessage = 0;
+let _reconnectDelay = 1000;
 
 const HTTP_POLL_INTERVAL = 10_000;   // Poll HTTP every 10 s as fallback
 const WS_STALE_TIMEOUT  = 35_000;   // If no WS message for 35 s → reconnect