[ademolabiyi92-design]

Overview

Add focused Jest and React Testing Library coverage for StatCard and fix the accessibility and layout issues the tests exposed.

Related Issue

Closes #422

Changes

• Add seven tests for values, accessible names and descriptions, repeated labels, variants, decorative icons, loading transitions, and disabled/focus states.
• Give repeated cards unique stable IDs, avoid a stale description reference while loading, and reserve description space to reduce layout shifts.
• Use theme-aware foreground classes and fluid sizing for light/dark themes and narrow containers; preserve a visible focus state and respect reduced motion for the spinner.

Verification Results

Focused Jest suite: 7 passed
ESLint (changed files): passed
Strict TypeScript (changed files): passed
Prettier (changed files): passed
Repository-wide pnpm typecheck: fails on pre-existing errors outside StatCard, including missing test dependencies and page/API type errors

Acceptance Criteria	Status
Jest + RTL rendering and state coverage	Complete
Responsive/theme-aware classes and accessible labels/states	Covered in component and unit tests
Browser-computed contrast and measured CLS	Requires browser visual/performance check; JSDOM cannot verify computed CSS or layout
Strict TypeScript, centralized styling, no any or inline styles	Complete

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