Fix/admin area overhaul - #19

Node.js 20 actions are deprecated. The following actions are running on Node.js 20 and may not work as expected: actions/checkout@v4, actions/setup-dotnet@v4. Actions will be forced to run with Node.js 24 by default starting June 16th, 2026. Node.js 20 will be removed from the runner on September 16th, 2026. Please check if updated versions of these actions are available that support Node.js 24. To opt into Node.js 24 now, set the FORCE_JAVASCRIPT_ACTIONS_TO_NODE24=true environment variable on the runner or in your workflow file. Once Node.js 24 becomes the default, you can temporarily opt out by setting ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Non-nullable property 'SourceCode' must contain a non-null value when exiting constructor. Consider adding the 'required' modifier or declaring the property as nullable.

Possible null reference argument for parameter 'expected' in 'bool DockerCodeExecutor.IsMatch(string actual, string expected)'.

The variable 'ex' is declared but never used

Possible null reference argument for parameter 'json' in 'JsonElement JsonSerializer.Deserialize<JsonElement>(string json, JsonSerializerOptions? options = null)'.

Converting null literal or possible null value to non-nullable type.

Converting null literal or possible null value to non-nullable type.

The type name 'ainaiv' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'ainaiv' only contains lower-cased ascii characters. Such names may become reserved for the language.

The type name 'cevau' only contains lower-cased ascii characters. Such names may become reserved for the language.