fix: keep amount display above keypad on short screens

[lemarjohnny781]

Summary

Closes #

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Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• 🚀 New feature (non-breaking change that adds functionality)
• 💥 Breaking change (fix or feature that would cause existing behaviour to change)
• ♻️ Refactor (no functional change, code quality improvement)
• 🎨 UI / design update
• 📦 Dependency update
• 🔧 Configuration / tooling change
• 📝 Documentation update
• 🔒 Security fix

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Changes Made

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Testing

• Manual testing in local development (npm run dev)
• Unit tests added or updated (npm test)
• Existing tests still pass (npm test)
• Tested on Stellar Testnet (if blockchain changes are included)
• Tested with demo mode OFF (NEXT_PUBLIC_DEMO_MODE=false)
• Verified on mobile viewport (if UI changes are included)

Test steps for reviewers:

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Screenshots / Screen Recording

Before	After

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Checklist

Code Quality

• Code follows the project's style and conventions (ESLint passes: npm run lint)
• TypeScript types are correct (no new any without justification): npm run type-check
• No secrets, wallet keys, or PII committed to the repository
• New NEXT_PUBLIC_* variables added to .env.example (if applicable)

Observability

• New API routes use captureError / log from lib/observability
• New Stellar SDK calls are wrapped in try/catch forwarding to captureError
• No sensitive data (private keys, mnemonics, tokens) passed to log.* or captureError

Security

• User inputs are validated with Zod (or equivalent) before processing
• No new server-side secrets are exposed via NEXT_PUBLIC_* variables
• Webhook signatures are verified where applicable
• Rate limiting applied to new public API endpoints (Upstash)

Accessibility (UI changes only)

• Interactive elements have accessible labels (aria-label, aria-describedby)
• Colour contrast meets WCAG AA (4.5:1 for normal text)
• Keyboard navigation works for new interactive components

Documentation

• Inline code comments added for non-obvious logic
• README or docs updated if the change affects setup or configuration
• SECURITY.md updated if the change affects the security surface (rare)

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Deployment Notes

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Related Issues / PRs

closes #490

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