🧹 fix: MCP Panel Regressions after UI refactor (#11312)

* fix: Revoke OAuth and Vars. Config Regressions in MCP Panel

- Introduced a new Trash2 icon button in MCPCardActions for revoking OAuth access on connected OAuth servers.
- Updated MCPServerCard to handle the revoke action, allowing users to revoke OAuth for specific servers.
- Enhanced user experience by ensuring the revoke option is available regardless of the server's connection state.

* refactor: Reorganize Revoke Button Logic in MCPCardActions and Update Toast Messages

- Moved the Revoke button for OAuth servers to a new position in MCPCardActions for improved visibility.
- Updated the success message logic in useMCPServerManager to differentiate between uninstall and variable update actions, enhancing user feedback.

* i18n: Add new translation for MCP server access revocation message

* refactor: Centralize Deselection Logic in updateUserPluginsMutation

- Updated the success handler in useUpdateUserPluginsMutation to manage deselection of MCP server values when revoking access, improving code clarity and reducing redundancy.
- Simplified message assignment logic for user feedback during plugin updates.

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

@@ -30,7 +30,7 @@ export default function MCPServerCard({
 }: MCPServerCardProps) {
   const localize = useLocalize();
   const triggerRef = useRef<HTMLDivElement>(null);
-  const { initializeServer } = useMCPServerManager();
+  const { initializeServer, revokeOAuthForServer } = useMCPServerManager();
   const [dialogOpen, setDialogOpen] = useState(false);
 
   const statusIconProps = getServerStatusIconProps(server.serverName);
@@ -50,9 +50,20 @@ export default function MCPServerCard({
   const canEdit = canCreateEditMCPs && canEditThisServer;
 
   const handleInitialize = () => {
+    /** If server has custom user vars and is not already connected, show config dialog first
+     *  This ensures users can enter credentials before initialization attempts
+     */
+    if (hasCustomUserVars && serverStatus?.connectionState !== 'connected') {
+      onConfigClick({ stopPropagation: () => {}, preventDefault: () => {} } as React.MouseEvent);
+      return;
+    }
     initializeServer(server.serverName);
   };
 
+  const handleRevoke = () => {
+    revokeOAuthForServer(server.serverName);
+  };
+
   const handleEditClick = (e: React.MouseEvent) => {
     e.stopPropagation();
     e.preventDefault();
@@ -130,6 +141,7 @@ export default function MCPServerCard({
             onConfigClick={onConfigClick}
             onInitialize={handleInitialize}
             onCancel={onCancel}
+            onRevoke={handleRevoke}
           />
         </div>
       </div>