⏳ refactor: MCP OAuth Polling with Gradual Backoff and Timeout Handling (#9752)

* refactor: Implement gradual backoff polling for oauth connection status with timeout handling

* refactor: Enhance OAuth polling with gradual backoff and timeout handling; update reconnection tracking

* refactor: reconnection timeout behavior in OAuthReconnectionManager and OAuthReconnectionTracker

- Implement tests to verify reconnection timeout handling, including tracking of reconnection states and cleanup of timed-out entries.
- Enhance existing methods in OAuthReconnectionManager and OAuthReconnectionTracker to support timeout checks and cleanup logic.
- Ensure proper handling of multiple servers with different timeout periods and edge cases for active states.

* chore: remove comment

* refactor: Enforce strict 3-minute OAuth timeout with updated polling intervals and improved timeout handling

* refactor: Remove unused polling logic and prevent duplicate polling for servers in MCP server manager

* refactor: Update localization key for no memories message in MemoryViewer

* refactor: Improve MCP tool initialization by handling server failures

- Introduced a mechanism to track failed MCP servers, preventing retries for unavailable servers.
- Added logging for failed tool creation attempts to enhance debugging and monitoring.

* refactor: Update reconnection timeout to enforce a strict 3-minute limit

* ci: Update reconnection timeout tests to reflect a strict 3-minute limit

* ci: Update reconnection timeout tests to enforce a strict 3-minute limit

* chore: Remove unused MCP connection timeout message

client/src/components/SidePanel/MCP/MCPPanel.tsx

@@ -1,4 +1,4 @@
-import React, { useState, useMemo, useCallback, useEffect } from 'react';
+import React, { useState, useMemo, useCallback } from 'react';
 import { ChevronLeft, Trash2 } from 'lucide-react';
 import { useQueryClient } from '@tanstack/react-query';
 import { Button, useToastContext } from '@librechat/client';
@@ -12,8 +12,6 @@ import { useLocalize, useMCPConnectionStatus } from '~/hooks';
 import { useGetStartupConfig } from '~/data-provider';
 import MCPPanelSkeleton from './MCPPanelSkeleton';
 
-const POLL_FOR_CONNECTION_STATUS_INTERVAL = 2_000; // ms
-
 function MCPPanelContent() {
   const localize = useLocalize();
   const queryClient = useQueryClient();
@@ -28,29 +26,6 @@ function MCPPanelContent() {
     null,
   );
 
-  // Check if any connections are in 'connecting' state
-  const hasConnectingServers = useMemo(() => {
-    if (!connectionStatus) {
-      return false;
-    }
-    return Object.values(connectionStatus).some(
-      (status) => status?.connectionState === 'connecting',
-    );
-  }, [connectionStatus]);
-
-  // Set up polling when servers are connecting
-  useEffect(() => {
-    if (!hasConnectingServers) {
-      return;
-    }
-
-    const intervalId = setInterval(() => {
-      queryClient.invalidateQueries([QueryKeys.mcpConnectionStatus]);
-    }, POLL_FOR_CONNECTION_STATUS_INTERVAL);
-
-    return () => clearInterval(intervalId);
-  }, [hasConnectingServers, queryClient]);
-
   const updateUserPluginsMutation = useUpdateUserPluginsMutation({
     onSuccess: async () => {
       showToast({ message: localize('com_nav_mcp_vars_updated'), status: 'success' });