feat: build vote delegation UI

[newmattock]

Fixes #55

Summary

• add a governance vote delegation panel with connected/disconnected states, current delegation status, delegate and undelegate actions, and controlled voting weight
• support Stellar G-address validation plus federation address resolution before submitting a delegate target
• add cycle detection copy for addresses that delegate back to the connected wallet
• add simulated governance delegation helpers and a small transaction wrapper consistent with the existing mocked governance contract layer
• cover delegation status, federation resolution, cycle warning, delegate, and undelegate paths with focused tests
• include the current governance Vetoed status build fix and Vitest @ alias fix

Validation

• npm test -- src/components/tests/VoteDelegationPanel.test.tsx --reporter verbose
• npx eslint src/components/VoteDelegationPanel.tsx src/components/tests/VoteDelegationPanel.test.tsx src/hooks/useTransaction.ts src/utils/governance.ts app/governance/page.tsx vitest.config.ts
• npm run build
• git diff --check
• local smoke: HEAD /governance returned HTTP 200 on port 3019
• in-app browser smoke: /governance exposed the Vote delegation panel