fix(index.css,Tooltip): CSS tokens undocumented in file, color-scheme dark missing causing light scrollbars, no Tooltip component despite Radix dep

[k-deejah]

Problem

1. index.css uses CSS custom properties for tokens but none are documented with their intended usage context — tokens like --color-ink-3, --color-surface-2, and --color-line-2 exist but a developer adding a new component doesn't know when to use ink-3 vs ink-4, or surface vs surface-2. No visual reference or usage guide exists.

2. index.css does not define color-scheme: dark on :root — without this declaration, browser UI elements (scrollbars, form controls, <select> dropdowns) render in light mode even though the app is dark-themed. On Chrome/Edge, this causes a jarring white scrollbar against a dark background.

3. The library has no Tooltip component despite @radix-ui/react-tooltip being in package.json — title attributes are used for tooltips throughout the codebase (e.g. FeeEstimator refresh button, AddressDisplay, InfoCell). Native title tooltips are inaccessible on mobile, delayed on desktop, and unstyled. A proper Tooltip component should replace all title usages.

Solution

1. Add a /* Design Token Reference */ comment block in index.css with a table of each token, its value, and intended use case.
2. Add color-scheme: dark to the :root selector in index.css.
3. Create src/components/ui/Tooltip.tsx using @radix-ui/react-tooltip, exported from index.ts, and replace key title usages in FeeEstimator and AddressDisplay.

Acceptance Criteria

• index.css has a token reference comment block
• Browser scrollbars and form controls render in dark mode
• Tooltip component exported from "sorokit-ui"
• FeeEstimator refresh button and AddressDisplay copy button use Tooltip instead of title
• npm run build passes

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Note for Contributors: Write a clear PR description. Include a screenshot of the dark scrollbar after adding color-scheme: dark, and a screenshot of the styled Tooltip in action.

[Stephan-Thomas]

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[jbeloved700]

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[DammyAji]

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hello maintainer can you please assign me to this issue. I am a frontend developer who has worked on projects using CSS previously. i have reviewed the description and i would be sure to deliver as described. Thanks in advance.

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[chukwunazannakenyi-netizen]

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