Cardano Updates

Add node monitoring dashboard, LMDB tooling, and critical bug fixes

Add LMDB FFI tools, Mithril stream server, and bootstrap explorer

- Estimate sync progress from preprod genesis time (slot = now - 1654041600)
- Track sync speed via rolling 30s window of slot advancement
- Read GC cycles from stable_state table
- Query peers from topology.json (bootstrap + publicRoots)
- Change node port from 3001 to 3030 in preprod config

Co-Authored-By: Claude Opus 4.6 <[email protected]>

All 6 dashboard pages now display only real data from the node's
database via the dashboard-server API. Empty states shown when
no data is available instead of fake fixtures.

- Overview: removed mockStatus, MOCK_CHAIN_STATE, ERA_BLOCK_COUNTS
- Blocks: removed generateMockTxHash, mockTxsForBlock, mockTxDetail, mockBlocks fallback
- Peers: removed mockPeers fallback and demo mode
- Mempool: removed mempool.json fixture fallback
- Explorer: removed MOCK_UTXOS, MOCK_DELTAS inline data
- Logs: removed generateMockLogs() and demo mode

Co-Authored-By: Claude Opus 4.6 <[email protected]>

- Bumped th/td text from text-[11px] to text-sm across Explorer, Peers, Mempool
- Increased cell padding from px-5 py-3 to px-6 py-4
- Widened content area max-width from 1120px to 1400px
- Removed fixed max-h constraints on table containers (flex-1 instead)
- Added table-fixed layout with explicit column widths on Explorer tables
- Explorer page now uses h-full to fill available viewport

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Complete rewrite of the SolidJS dashboard with a proper layout system,
new pages, real-time chain visualization, and mock data fallbacks for
offline development.

What changed:
- New layout: collapsible sidebar nav, topbar, footer status bar, right
  chain diagram panel
- ROG cyberpunk theme with neon red/orange/green accents, glass-morphism
  cards, glow effects
- Virtualized chain diagram using TanStack solid-virtual — handles
  thousands of blocks, keyboard navigable, era-colored block nodes
- Expandable block cards with full tx detail panel (inputs, outputs,
  scripts, collateral, mint/burn, metadata)
- New pages: Mempool (sortable tx table, auto-refresh), Settings
  (high-contrast, color-blind modes, i18n, about)
- All pages fall back to realistic mock data when node isn't synced
- 104 unit tests across 7 test files, E2E build smoke test
- GitHub Actions CI: lint, test, build on push to dashboard/
- Dockerfile for containerized deployment (multi-stage bun build)
- i18n pipeline with en-US locale, extensible
- WCAG AA accessibility: ARIA labels, keyboard nav, focus-visible rings,
  prefers-reduced-motion, screen reader support
- Charts: SVG ProgressRing and LineChart components
- Typed API client with SSE hooks and error handling
- Zero tsc errors, 148-module Vite build in ~890ms

Co-Authored-By: Claude Opus 4.6 <[email protected]>