🔌 refactor: MCP UI with Improved Accessibility and Reusable Components (#11118)

* feat: enhance MCP server selection UI with new components and improved accessibility

* fix(i18n): add missing com_ui_mcp_servers translation key

The MCP server menu aria-label was referencing a non-existent translation
key. Added the missing key for accessibility.

* feat(MCP): enhance MCP components with improved accessibility and focus management

* fix(i18n): remove outdated MCP server translation keys

* fix(MCPServerList): improve color contrast by updating text color for no MCP servers message

* refactor(MCP): Server status components and improve user action handling
Updated MCPServerStatusIcon to use a unified icon system for better clarity
Introduced new MCPCardActions component for standardized action buttons on server cards
Created MCPServerCard component to encapsulate server display logic and actions
Enhanced MCPServerList to render MCPServerCard components, improving code organization
Added MCPStatusBadge for consistent status representation in dialogs
Updated utility functions for status color and text retrieval to align with new design
Improved localization keys for better clarity and consistency in user messages

* style(MCP): update button and card background styles for improved UI consistency

* feat(MCP): implement global server initialization state management using Jotai

* refactor(MCP): modularize MCPServerDialog into structured component architecture

- Split monolithic dialog into dedicated section components (Auth, BasicInfo, Connection, Transport, Trust)
- Extract form logic into useMCPServerForm custom hook
- Add utility modules for JSON import and URL handling
- Introduce reusable SecretInput component in @librechat/client
- Remove deprecated MCPAuth component

* style(MCP): update button styles for improved layout and adjust empty state background color

* refactor(Radio): enhance component mounting logic and background style updates

* refactor(translation): remove unused keys and streamline localization strings

client/src/components/SidePanel/MCPBuilder/MCPServerCard.tsx

@@ -0,0 +1,152 @@
+import { useState, useRef } from 'react';
+import { MCPIcon } from '@librechat/client';
+import { PermissionBits, hasPermissions } from 'librechat-data-provider';
+import type { MCPServerStatusIconProps } from '~/components/MCP/MCPServerStatusIcon';
+import type { MCPServerDefinition } from '~/hooks';
+import MCPServerDialog from './MCPServerDialog';
+import { getStatusDotColor } from './MCPStatusBadge';
+import MCPCardActions from './MCPCardActions';
+import { useMCPServerManager, useLocalize } from '~/hooks';
+import { cn } from '~/utils';
+
+interface MCPServerCardProps {
+  server: MCPServerDefinition;
+  getServerStatusIconProps: (serverName: string) => MCPServerStatusIconProps;
+  canCreateEditMCPs: boolean;
+}
+
+/**
+ * Compact card component for displaying an MCP server with status and actions.
+ *
+ * Visual design:
+ * - Status shown via colored dot on icon (no separate badge - avoids redundancy)
+ * - Action buttons clearly indicate available operations
+ * - Consistent with MCPServerMenuItem in chat dropdown
+ */
+export default function MCPServerCard({
+  server,
+  getServerStatusIconProps,
+  canCreateEditMCPs,
+}: MCPServerCardProps) {
+  const localize = useLocalize();
+  const { initializeServer } = useMCPServerManager();
+  const [dialogOpen, setDialogOpen] = useState(false);
+  const triggerRef = useRef<HTMLButtonElement>(null);
+
+  const statusIconProps = getServerStatusIconProps(server.serverName);
+  const {
+    serverStatus,
+    onConfigClick,
+    isInitializing,
+    canCancel,
+    onCancel,
+    hasCustomUserVars = false,
+  } = statusIconProps;
+
+  const canEditThisServer = hasPermissions(server.effectivePermissions, PermissionBits.EDIT);
+  const displayName = server.config?.title || server.serverName;
+  const description = server.config?.description;
+  const statusDotColor = getStatusDotColor(serverStatus, isInitializing);
+  const canEdit = canCreateEditMCPs && canEditThisServer;
+
+  const handleInitialize = () => {
+    initializeServer(server.serverName);
+  };
+
+  const handleEditClick = (e: React.MouseEvent) => {
+    e.stopPropagation();
+    e.preventDefault();
+    setDialogOpen(true);
+  };
+
+  // Determine status text for accessibility
+  const getStatusText = () => {
+    if (isInitializing) return localize('com_nav_mcp_status_initializing');
+    if (!serverStatus) return localize('com_nav_mcp_status_unknown');
+    const { connectionState, requiresOAuth } = serverStatus;
+    if (connectionState === 'connected') return localize('com_nav_mcp_status_connected');
+    if (connectionState === 'connecting') return localize('com_nav_mcp_status_connecting');
+    if (connectionState === 'error') return localize('com_nav_mcp_status_error');
+    if (connectionState === 'disconnected') {
+      return requiresOAuth
+        ? localize('com_nav_mcp_status_needs_auth')
+        : localize('com_nav_mcp_status_disconnected');
+    }
+    return localize('com_nav_mcp_status_unknown');
+  };
+
+  return (
+    <>
+      <div
+        className={cn(
+          'group flex items-center gap-3 rounded-lg px-3 py-2.5',
+          'border border-border-light bg-transparent',
+        )}
+        aria-label={`${displayName} - ${getStatusText()}`}
+      >
+        {/* Server Icon with Status Dot */}
+        <div className="relative flex-shrink-0">
+          {server.config?.iconPath ? (
+            <img
+              src={server.config.iconPath}
+              className="size-8 rounded-lg object-cover"
+              alt=""
+              aria-hidden="true"
+            />
+          ) : (
+            <div className="flex size-8 items-center justify-center rounded-lg bg-surface-tertiary">
+              <MCPIcon className="size-5 text-text-secondary" aria-hidden="true" />
+            </div>
+          )}
+          {/* Status dot - color indicates connection state */}
+          <div
+            className={cn(
+              'absolute -bottom-0.5 -right-0.5 size-3 rounded-full',
+              'border-2 border-surface-primary',
+              statusDotColor,
+              (isInitializing || serverStatus?.connectionState === 'connecting') && 'animate-pulse',
+            )}
+            aria-hidden="true"
+          />
+        </div>
+
+        {/* Server Info */}
+        <div className="min-w-0 flex-1">
+          <span className="truncate text-sm font-medium text-text-primary">{displayName}</span>
+          {description && <p className="truncate text-xs text-text-secondary">{description}</p>}
+        </div>
+
+        {/* Actions */}
+        <div className="flex-shrink-0">
+          <MCPCardActions
+            serverName={server.serverName}
+            serverStatus={serverStatus}
+            isInitializing={isInitializing}
+            canCancel={canCancel}
+            hasCustomUserVars={hasCustomUserVars}
+            canEdit={canEdit}
+            onEditClick={handleEditClick}
+            onConfigClick={onConfigClick}
+            onInitialize={handleInitialize}
+            onCancel={onCancel}
+          />
+        </div>
+      </div>
+
+      {/* Edit Dialog - separate from card */}
+      {canEdit && (
+        <MCPServerDialog
+          open={dialogOpen}
+          onOpenChange={setDialogOpen}
+          triggerRef={triggerRef}
+          server={server}
+        >
+          {/* Hidden trigger for focus management */}
+          <button ref={triggerRef} className="sr-only" tabIndex={-1} aria-hidden="true">
+            {localize('com_ui_edit')} {displayName}
+          </button>
+        </MCPServerDialog>
+      )}
+    </>
+  );
+}