🔑 refactor: MCP Settings Rendering Logic for OAuth Servers (#8718)

* feat: add OAuth servers to conditional rendering logic for MCPPanel in SideNav

* feat: add startup flag check to conditional rendering logic

* fix: correct improper handling of failure state in reinitialize endpoint

* fix: change MCP config components to better handle servers without customUserVars

- removes the subtle reinitialize button from config components of servers without customUserVars or OAuth
- adds a placeholder message for components where servers have no customUserVars configured

* style: swap CustomUserVarsSection and ServerInitializationSection positions

* style: fix coloring for light mode and align more with existing design patterns

* chore: remove extraneous comments

* chore: reorder imports and `isEnabled` from api package

---------

Co-authored-by: Danny Avila <danny@librechat.ai>

client/src/hooks/MCP/useMCPServerManager.ts

@@ -234,6 +234,12 @@ export function useMCPServerManager() {
 
             cleanupServerState(serverName);
           }
+        } else {
+          showToast({
+            message: localize('com_ui_mcp_init_failed', { 0: serverName }),
+            status: 'error',
+          });
+          cleanupServerState(serverName);
         }
       } catch (error) {
         console.error(`[MCP Manager] Failed to initialize ${serverName}:`, error);

client/src/hooks/Nav/useSideNavLinks.ts

@@ -155,7 +155,10 @@ export default function useSideNavLinks({
     if (
       startupConfig?.mcpServers &&
       Object.values(startupConfig.mcpServers).some(
-        (server) => server.customUserVars && Object.keys(server.customUserVars).length > 0,
+        (server: any) =>
+          (server.customUserVars && Object.keys(server.customUserVars).length > 0) ||
+          server.isOAuth ||
+          server.startup === false,
       )
     ) {
       links.push({