Revert "[wifi] Revert cyw43_wifi_link_status change for RP2040"

This reverts commit 1b5bf2c848.

esphome/components/wifi/wifi_component_pico_w.cpp

@@ -121,7 +121,12 @@ const char *get_disconnect_reason_str(uint8_t reason) {
 }
 
 WiFiSTAConnectStatus WiFiComponent::wifi_sta_connect_status_() const {
-  int status = cyw43_tcpip_link_status(&cyw43_state, CYW43_ITF_STA);
+  // Use cyw43_wifi_link_status instead of cyw43_tcpip_link_status because the Arduino
+  // framework's __wrap_cyw43_cb_tcpip_init is a no-op — the SDK's internal netif
+  // (cyw43_state.netif[]) is never initialized. cyw43_tcpip_link_status checks that netif's
+  // flags and would only fall through to cyw43_wifi_link_status when the flags aren't set.
+  // Using cyw43_wifi_link_status directly gives us the actual WiFi radio join state.
+  int status = cyw43_wifi_link_status(&cyw43_state, CYW43_ITF_STA);
   switch (status) {
     case CYW43_LINK_JOIN:
       // WiFi joined, check if we have an IP address via the Arduino framework's WiFi class