Implement liquidity and staking management interfaces

[BigDella]

Summary

• Adds a liquidity pool dashboard with pool composition, 24h volume, fee tracking, LP position metrics, add/remove liquidity previews, share percentage math, and an impermanent loss calculator.
• Adds a staking dashboard with pool analytics, APY display, projected earnings, stake/unstake controls, staking history, and claim-all rewards summary.
• Adds top-level navigation links for Liquidity and Staking.

Validation

• npx eslint src/app/liquidity/page.tsx src/app/staking/page.tsx src/components/AddLiquidity.tsx src/components/PoolStats.tsx src/components/StakingCard.tsx src/components/RewardsClaim.tsx src/components/Header.tsx
• curl http://localhost:3000/liquidity returned 200 from npm run dev -- --hostname 0.0.0.0
• curl http://localhost:3000/staking returned 200 from npm run dev -- --hostname 0.0.0.0

Notes

• Full npm run lint, npm run build, and npx tsc --noEmit --pretty false are currently blocked by pre-existing unrelated frontend issues, including missing textarea, progress, and separator UI modules, React purity violations in existing admin/governance/verification code, and missing i18n dependencies.

Closes #252
Closes #253

[drips-wave]

@BigDella Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits