feat: build LP portfolio dashboard

[newmattock]

Fixes #26

Summary

• add a dedicated /dashboard/lp route for LP portfolio overview
• add LP stats cards for deployed capital by token, total earned, active positions, and average yield
• add an active funded invoice position table with pagination and Transfer Position CTAs
• wire the page to get_lp_portfolio_stats() and list_invoices_by_lp() contract reads for the connected wallet
• add focused rendering and pagination tests
• include current-main build fixes for governance Vetoed status/deferred refresh, federation typing, evidence hashing, TokenSelector typing, and existing soroban transaction typings

Validation

• npm test -- app/dashboard/lp/tests/LPPortfolioDashboard.test.tsx --reporter verbose
• npm run lint -- app/dashboard/lp/page.tsx app/dashboard/lp/tests/LPPortfolioDashboard.test.tsx src/components/LPStatsCards.tsx src/components/LPPositionTable.tsx src/utils/soroban.ts app/governance/page.tsx src/utils/federation.ts src/utils/evidence.ts src/components/TokenSelector.tsx
• npm run build
• git diff --check
• local HTTP smoke: HEAD /dashboard/lp returned 200 on port 3026