feat(k1): stabilize LAB bridge and isolate onboard device integration

plugins/xgrids-k1/frontend/src/XgridsK1Connection.tsx

@@ -275,6 +275,11 @@ export function XgridsK1Connection({ model, host }: DevicePluginConnectionProps)
         : sourceRuntimeBusy || preparedAcquisition
           ? "warning"
           : "neutral";
+  const connectionAttemptFailed = !sourceRuntimeBusy && !preparedAcquisition
+    && connectionTopology?.status !== "active"
+    && state?.connection_attempt?.connection_mode === effectiveDesiredConnectionMode
+    && ["failed", "cancelled", "timed_out", "interrupted", "operator_action_required"]
+      .includes(state.connection_attempt.status);
   const connectionControlBootstrapSettling =
     isConnectionControlBootstrapSettling(state);
   const connectionPhaseLabel = livePreparationPending
@@ -293,6 +298,8 @@ export function XgridsK1Connection({ model, host }: DevicePluginConnectionProps)
         ? savedBridgeNetworkSetupRequired
           ? "Нужна настройка сети"
           : "Требуется действие"
+    : connectionAttemptFailed
+      ? "Подключение не завершено"
     : projectedPhase === "error"
       ? connectionPhaseFallbackLabel(projectedPhase)
       : connectionTopology?.status === "active"
@@ -316,6 +323,8 @@ export function XgridsK1Connection({ model, host }: DevicePluginConnectionProps)
       ? "accent"
     : physicalRecoveryRequired
       ? "warning"
+    : connectionAttemptFailed
+      ? "warning"
     : projectedPhase === "error"
       ? phaseTone(projectedPhase)
       : connectionTopology?.status === "active"
@@ -336,6 +345,8 @@ export function XgridsK1Connection({ model, host }: DevicePluginConnectionProps)
     : physicalRecoveryRequired
       ? physicalRecoveryDetail
         ?? "Безопасное восстановление прежнего K1 сейчас недоступно."
+      : connectionAttemptFailed
+        ? "Проверьте состояние K1 или начните новое подключение."
       : !sourceRuntimeBusy && connectionTopology?.status === "configured-unverified"
         ? "Начните новое подключение."
         : !sourceRuntimeBusy && connectionTopology?.status === "active"