feat: render validation messages and alerts in loading_spinner_skeleton (#277) - #387

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

'Story' is defined but never used

'index' is defined but never used

'MAINNET_PASSPHRASE' is assigned a value but never used

'_n' is assigned a value but never used

'_a' is assigned a value but never used

'container' is assigned a value but never used

'mockJob' is defined but never used

'userEvent' is defined but never used

'fireEvent' is defined but never used