feat(Badge): support size variants (sm/md/lg)

[Derinsolababy]

Summary

The Badge component hardcoded its dimensions (px-2.5 py-0.5 text-[10px]), so every badge in the app rendered at the same size regardless of context. This PR adds an optional size prop.

Changes

src/components/Badge.tsx

• New exported type BadgeSize = 'sm' | 'md' | 'lg' and optional size prop.
• New SIZE_CLASSES map controlling gap, padding and font size:

  size	classes
  sm (default)	gap-1 px-2.5 py-0.5 text-[10px]
  md	gap-1.5 px-3 py-1 text-xs
  lg	gap-2 px-4 py-1.5 text-sm

• Size classes are no longer hardcoded in the base class string; shape, weight, casing and colour logic are untouched.

src/components/__tests__/Badge.test.tsx

• Tests that the default is sm and preserves the original classes.
• Tests for md and lg class application.

Backwards compatibility

size defaults to sm, which produces exactly the previous classes, so all existing call sites (dashboard, policies, pools, oracle, ClaimStatus, PolicyCard, etc.) render identically. No call sites needed changing.

Testing

• npx vitest run src/components/__tests__/Badge.test.tsx → 6/6 passing (3 existing + 3 new).
• tsc --noEmit reports no errors in Badge files.

Usage

<Badge label="Active" />            // sm (unchanged)
<Badge label="Active" size="md" />
<Badge label="Active" size="lg" />

Closes #62
Closes #648
Closes #649
Closes #650

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