CodeEditor does not apply Monaco theme on initial render

## Description

The `CodeEditor` component does not load the Monaco editor theme on the initial render. The editor appears with the default theme instead of the configured one. On subsequent renders (e.g., closing and reopening the dialog), the theme is applied correctly.

This is visible in the Error Details dialog where the JSON code editor briefly shows with an incorrect theme before correcting itself.

## Environment

- OS: Any
- Browser: Any
- Graph Explorer Version: latest (main)
- Graph Database & Version: Any

## Steps to Reproduce

1. Trigger an error that includes response data (e.g., a network error with a JSON body)
2. Click "Error Details" to open the dialog
3. Observe the code editor renders without the correct theme
4. Close and reopen the dialog
5. The theme is now applied correctly

## Expected Behavior

The Monaco editor theme should be applied on the first render without requiring a re-render cycle.

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Start by locating the CodeEditor component and the Error Details dialog, then reproduce the initial render and compare it with reopening the dialog. The work is done when the configured Monaco theme appears immediately in the editor on its first render, without relying on a later re-render.

Written by the indexing model from the issue text.