fix(network): open Wi-Fi password modal upfront for enterprise networks (#2414)

NetworkManager rejects AddConnection for 802-1x without a non-empty
identity, so the new API v7 agent-prompt flow never reaches the
SecretAgent for fresh enterprise connections. Fall back to the existing
modal-upfront path (already wired to ask for username + password via
requiresEnterprise) when modelData.enterprise, mirroring the legacy
DMSService.apiVersion < 7 branch.

Fixes #2358

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

quickshell/Modules/Settings/NetworkTab.qml

@@ -1324,6 +1324,10 @@ Item {
                                                         NetworkService.disconnectWifi();
                                                         return;
                                                     }
+                                                    if (modelData.secured && !modelData.saved && (DMSService.apiVersion < 7 || modelData.enterprise)) {
+                                                        PopoutService.showWifiPasswordModal(modelData.ssid);
+                                                        return;
+                                                    }
                                                     NetworkService.connectToWifi(modelData.ssid);
                                                 }
                                             }