fix: resolve issues #428, #453, #455, #457

[Nanle-code]

#428 - Contributor issue claim and progress tracker

• Add status: claimed/in-progress/needs-update/available labels to .github/labels.yml
• Add .github/ISSUE_TEMPLATE/claim_issue.yml for structured claim comments
• Add .github/PROGRESS_UPDATE.md template for 7-day progress updates
• Document claim lifecycle in CONTRIBUTING.md with label table

#453 - Mobile navigation drawer for dashboard routes

• Add hamburger Menu/X toggle button (hidden on md+) to nav bar
• Add slide-in mobile drawer with all routes, wallet-gated sections, and quick actions
• Drawer closes on route change via useLocation + useEffect
• Hide desktop nav-links on small screens (hidden md:flex)
• Add .drawer-link CSS utility to client/src/index.css

#455 - Backend health endpoint dependency breakdown

• Add /health/dependencies route to server/src/routes/health.ts
• Returns per-dependency status (database, horizon, indexer, cache) with latency hints
• Returns 503 when any dependency is down, 200 for warning/up
• Never exposes credentials or private data
• Add full test suite in server/src/tests/health.dependencies.test.ts
• Install @types/jest, @types/node, @types/supertest, supertest dev deps

#457 - Contract error code reference

• Add contracts/ERROR_CODES.md with per-contract error tables
• Covers VaultError, StableSwapError, IsolatedLendingError, LiquidStaking Error, OptimisticGovernance Error, SettlementError, BridgeRelayerError, ZapError, StealthError
• Each entry includes code, name, meaning, and operator remediation
• Documents panic paths for untyped failures
• No contract behavior changed

Closes #428
Closes #453
Closes #455
Closes #457

Description

Fixes # (issue number)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Verification Commands

• npm run lint / npm run test (Frontend/Backend)
• cargo fmt / cargo clippy / cargo test (Smart Contracts)

Contract Security (if contracts/ changed)

• Storage schema changes documented or migration provided
• All entry points have authorization checks
• Arithmetic uses checked operations
• New entry points have unit tests including unauthorized callers
• No new admin roles without governance proposal

Screenshots (if applicable)

Add screenshots to help explain the changes.

UI Snapshot Checklist

• Screenshots provided for Desktop (1024px+)
• Screenshots provided for Mobile (375px)
• No visual changes

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