🔑 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>

api/server/routes/mcp.js

@@ -452,11 +452,19 @@ router.post('/:serverName/reinitialize', requireJwtAuth, async (req, res) => {
       `[MCP Reinitialize] Sending response for ${serverName} - oauthRequired: ${oauthRequired}, oauthUrl: ${oauthUrl ? 'present' : 'null'}`,
     );
 
+    const getResponseMessage = () => {
+      if (oauthRequired) {
+        return `MCP server '${serverName}' ready for OAuth authentication`;
+      }
+      if (userConnection) {
+        return `MCP server '${serverName}' reinitialized successfully`;
+      }
+      return `Failed to reinitialize MCP server '${serverName}'`;
+    };
+
     res.json({
-      success: true,
-      message: oauthRequired
-        ? `MCP server '${serverName}' ready for OAuth authentication`
-        : `MCP server '${serverName}' reinitialized successfully`,
+      success: userConnection && !oauthRequired,
+      message: getResponseMessage(),
       serverName,
       oauthRequired,
       oauthUrl,