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ESP_GATTC_DISCONNECT_EVT only indicates that the link-layer disconnection has started, not that the controller has fully freed resources (L2CAP channels, ATT resources, HCI connection handle). Transitioning to IDLE immediately allowed reconnection attempts before cleanup was complete, causing the controller to reject new connections with status=133 (ESP_GATT_CONN_FAIL_ESTABLISH) or crash with ASSERT_PARAM in lld_evt.c. This applies the same fix that was made for bluetooth_proxy in #10303 to the base BLEClientBase class, which is used by the ble_client component. Changes: - DISCONNECT_EVT now transitions to DISCONNECTING instead of IDLE - CLOSE_EVT (already existing) handles the final IDLE transition - connect() now blocks while in DISCONNECTING state - OPEN_EVT ignores events received during DISCONNECTING state
