fix(validation): respect settings-bound provider and correct multimodal heuristic

frontend/src/components/DashboardGrid.svelte

@@ -51,30 +51,11 @@
     validatingIds = new Set(validatingIds);
 
     try {
-      // TODO: Get provider_id from settings or prompt user
-      // For now, we assume a default provider or let the backend handle it if possible,
-      // but the plugin requires provider_id.
-      // In a real implementation, we might open a modal to select provider if not configured globally.
-      // Or we pick the first active one.
-
-      // Fetch active provider first
-      const providers = await api.fetchApi("/llm/providers");
-      const activeProvider = providers.find((p: any) => p.is_active);
-
-      if (!activeProvider) {
-        toast(
-          "No active LLM provider found. Please configure one in settings.",
-          "error",
-        );
-        return;
-      }
-
       await api.postApi("/tasks", {
         plugin_id: "llm_dashboard_validation",
         params: {
           dashboard_id: dashboard.id.toString(),
           environment_id: environmentId,
-          provider_id: activeProvider.id,
         },
       });