feat: issue-93/94

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closes #93
closes #94

PR Summary

This PR resolves two related issues by fixing responsive behavior in the dashboard UI and completing the library public export surface.

What changed

Responsive fixes (Issue #94)

• Updated src/screens/Dashboard.tsx to prevent the main content area from collapsing on short viewports by adding min-h-0 to the flex child container.
• Updated src/components/TopBar.tsx to prevent header overflow at 320px by allowing the right-side controls to wrap, keeping NetworkSwitcher and WalletConnectButton usable on narrow mobile screens.
• Updated src/components/TransactionHistory.tsx to ensure pagination buttons meet the 44px touch target minimum on mobile by applying min-h-[44px] to the button controls.

Export API fixes (Issue #93)

• Added missing public exports to src/components/index.ts:
  • AddressDisplay
  • AssetPill
  • FeeEstimator
  • ContractEventFeed
• Re-exported missing shared type definitions from src/lib/client.ts through the public API:
  • AccountData
  • Balance
  • Transaction
  • ClaimableBalance
  • ContractEvent
  • NetworkInfo
  • InvokeParams
• Added a smoke test in src/__tests__/exports.test.ts verifying the public exports surface and the re-exported types.

Why these changes were needed

• The dashboard layout previously assumed a tall viewport, causing flex-1 to collapse on shorter devices such as landscape mobile.
• The TopBar header overflowed at the narrowest common mobile viewport because the controls did not wrap.
• Transaction pagination buttons were smaller than the recommended 44px mobile touch target.
• Several components and type definitions were missing from the library's public export surface, preventing consumers from importing them directly from sorokit-ui.

Verification

• The public exports smoke test ensures the API surface remains intact in CI.
• The added responsive changes target the reported mobile breakpoints and touch target sizes.

Files changed

• src/screens/Dashboard.tsx
• src/components/TopBar.tsx
• src/components/TransactionHistory.tsx
• src/components/index.ts
• src/__tests__/exports.test.ts

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@k-deejah please review