feat(governance): implement governance voting dashboard with real-time proposal tracking (#174)

[Simultech369]

Summary of Changes

This pull request resolves #174 by implementing a governance voting dashboard for VRN token holders, supporting active/passed/defeated proposal lifecycles, real-time vote distribution and quorum progress, token-weighted and quadratic voting mechanisms, community delegate management, on-chain parameter proposal creation, and historical vote logging with CSV export.

🎯 Key Implementations

1. Governance Domain Models & Store (src/types/governance.ts, src/store/governanceStore.ts)

   • Implemented schemas for Proposal, ProposalStatus, ProposalCategory, VotingType, VoteRecord, Delegate, CreateProposalInput, and QuorumProgress.
   • Linear ($1:1$) and quadratic ($\sqrt{\text{tokens}}$) voting weight algorithms.
   • Quorum tracking and vote distribution share percentages.
   • Comprehensive state management for proposals, status/category filtering, delegate tracking, voting power, and vote history.

2. UI & Dashboard Components (src/components/governance/, app/governance/page.tsx)

   • ProposalList.tsx: Filterable proposal catalog with status tabs, category filtering, live search, quorum progress bars, and vote share breakdown indicators.
   • ProposalDetail.tsx: Full proposal review with description markdown rendering, executable parameter actions, vote distribution charts, interactive voting power slider (25%, 50%, 75%, 100% presets), dynamic weight preview, and gas cost estimation.
   • DelegateManager.tsx: Delegation status banner, community delegate search, voting power/participation metrics, custom address delegation, and revocation controls.
   • ProposalCreator.tsx: Structured proposal submission form with title, description preview, category picker, voting type selector, parameter action builder, and deposit requirement indicator.
   • VoteHistoryTable.tsx: Per-user audit log with proposal title, choice badge, voting power, effective weight, voting mechanism, tx hash, gas cost, timestamp, and CSV download export.
   • app/governance/page.tsx: Responsive dashboard with top-level protocol metrics (Total Proposals, Active Proposals, Average Turnout, User Voting Power, Delegation Status).

3. Comprehensive Unit & Component Tests (src/__tests__/governance.test.ts, src/__tests__/governanceComponents.test.tsx)

   • 33 test cases verifying store state transitions, quadratic vs token-weighted voting math, quorum calculations, delegation/revocation, proposal creation validation, CSV formatting, and React component interactivity.

---

🧪 Verification & Testing

• npm run test:unit: