feat: add accessible VaultProgressBar primitive

[go165]

Summary

• Adds a reusable VaultProgressBar primitive with clamped 0-100 values, NaN/non-finite handling, ARIA progressbar semantics, optional labels, and semantic token-driven fill colors.
• Wires VaultCard to render progress from its existing progressPct prop and reuses the primitive in VaultDetail; Dashboard consumes it through VaultCard.
• Adds focused component/card tests plus design-system documentation.

Closes #130

Verification

• npm test -- --run src/components/__tests__/VaultProgressBar.test.tsx src/components/__tests__/VaultCard.test.tsx -> 2 files / 9 tests passed; VaultProgressBar.tsx and VaultCard.tsx reported 100% coverage.
• npx tsc --noEmit --pretty false --skipLibCheck --jsx react-jsx --module ESNext --target ES2020 --moduleResolution Bundler --allowSyntheticDefaultImports --esModuleInterop src/components/VaultProgressBar.tsx src/components/VaultCard.tsx src/pages/VaultDetail.tsx -> passed.
• git diff --check -> passed.

Note: repo-wide npx tsc -b --pretty false still fails on the upstream src/components/Field.tsx forwardRef syntax issue (TS1005 at lines 68-69), which is unrelated to this change.

Payout

0x1f0130669ca6fd02e025a984cc038f139df19a2f