feat: add Storybook and Chromatic visual regression testing - #348

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v4, 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/

'InvoicesResponse' is defined but never used. Allowed unused vars must match /^_/u

'healthState' is assigned a value but never used. Allowed unused vars must match /^_/u

'Wifi' is defined but never used. Allowed unused vars must match /^_/u

'Wifi' is defined but never used. Allowed unused vars must match /^_/u

'SettingsIcon' is defined but never used. Allowed unused vars must match /^_/u

'toast' is assigned a value but never used. Allowed unused vars must match /^_/u

'Shield' is defined but never used. Allowed unused vars must match /^_/u

'handler' is defined but never used. Allowed unused vars must match /^_/u

'withRateLimit' is defined but never used. Allowed unused vars must match /^_/u