🧹 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/hooks/MCP/useMCPServerManager.ts

@@ -94,8 +94,20 @@ export function useMCPServerManager({ conversationId }: { conversationId?: strin
   const cancelOAuthMutation = useCancelMCPOAuthMutation();
 
   const updateUserPluginsMutation = useUpdateUserPluginsMutation({
-    onSuccess: async () => {
-      showToast({ message: localize('com_nav_mcp_vars_updated'), status: 'success' });
+    onSuccess: async (_data, variables) => {
+      const isRevoke = variables.action === 'uninstall';
+      const message = isRevoke
+        ? localize('com_nav_mcp_access_revoked')
+        : localize('com_nav_mcp_vars_updated');
+      showToast({ message, status: 'success' });
+
+      /** Deselect server from mcpValues when revoking access */
+      if (isRevoke && variables.pluginKey?.startsWith(Constants.mcp_prefix)) {
+        const serverName = variables.pluginKey.replace(Constants.mcp_prefix, '');
+        const currentValues = mcpValuesRef.current ?? [];
+        const filteredValues = currentValues.filter((name) => name !== serverName);
+        setMCPValues(filteredValues);
+      }
 
       await Promise.all([
         queryClient.invalidateQueries([QueryKeys.mcpServers]),
@@ -491,13 +503,10 @@ export function useMCPServerManager({ conversationId }: { conversationId?: strin
           auth: {},
         };
         updateUserPluginsMutation.mutate(payload);
-
-        const currentValues = mcpValues ?? [];
-        const filteredValues = currentValues.filter((name) => name !== targetName);
-        setMCPValues(filteredValues);
+        /** Deselection is now handled centrally in updateUserPluginsMutation.onSuccess */
       }
     },
-    [selectedToolForConfig, updateUserPluginsMutation, mcpValues, setMCPValues],
+    [selectedToolForConfig, updateUserPluginsMutation],
   );
 
   /** Standalone revoke function for OAuth servers - doesn't require selectedToolForConfig */