Q Dev Plugin Not Working with Miro MCP

## Problem

Both Visual Studio Code and IntelliJ Q Dev plugins do not work with the Miro MCP server. The issue is with the OAuth scope.

Error
```
MCP: server 'miro-mcp' failed to connect (OAuth): MCP: OAuth failed: OAuth client registration failed: HTTP 400@https://mcp.miro.com/register — {"error":"invalid_client_metadata","error_description":"Requested scopes are not valid: offline_access, openid"}
```

## Steps to reproduce the issue

Follow instructions here https://developers.miro.com/docs/connecting-miro-mcp-to-ai-coding-tools#amazon-q-ide-extension
set http MCP server to https://mcp.miro.com/

## Expected behavior

Connect to Miro MCP server to authenticate.

This could be resolved by setting, "oauthScopes": [], in the amazonq mcp.json file, however, when the save button is hit, which is a requirement to being authentication, any custom changes to the MCP server are reset.

Note that this was fixed in the CLI back in September https://github.com/aws/amazon-q-developer-cli/pull/2925

## System details (run `AWS: About` and/or `Amazon Q: About`)

- OS: Windows
Version: 1.100.2 (system setup)
Commit: 848b80aeb52026648a8ff9f7c45a9b0a80641e2e
Date: 2025-05-14T21:47:40.416Z
Electron: 34.5.1
ElectronBuildId: 11369351
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Windows_NT x64 10.0.26100
- AWS Toolkit version:
3.93.0
- Amazon Q version:
1.107.0

Start with the Amazon Q MCP configuration and save flow described in the issue, then compare the VS Code and IntelliJ plugin behavior with the CLI fix in PR #2925. Reproduce against https://mcp.miro.com/ using the linked Miro MCP instructions; done means authentication succeeds and saving the server configuration no longer removes the required OAuth scope setting.

Written by the indexing model from the issue text.