feat: Implement a web dashboard UI for interactive audit report visualization

[Nanle-code]

Overview

ChainProof currently outputs audit results as Markdown, JSON, or a terminal table. While these formats are useful for CI pipelines and developers comfortable with the terminal, they provide a poor experience for security reviewers, project managers, and stakeholders who need to triage and track findings interactively. A web dashboard would unlock significantly broader adoption.

Proposed Feature

A new package @chainproof/dashboard that:

1. Spins up a local HTTP server serving a React SPA
2. Reads a chainproof-results.json file (or accepts piped scan output)
3. Presents findings in an interactive, filterable UI

UI Components

Findings Table

• Filterable by severity, file, rule ID
• Sortable by line number, severity, file
• Click-to-expand inline code snippet with syntax highlighting
• "Copy fix recommendation" button

Summary Dashboard

• Severity donut chart (critical / high / medium / low / gas)
• Per-file severity heatmap
• Trend chart if multiple scan results are loaded (historical comparison)

Finding Detail Panel

• Full description and recommendation
• SWC registry deep link
• LLM-enhanced explanation rendered as rich text (if present)
• Exploit scenario section (if present)
• Code diff preview showing vulnerable vs fixed snippet

Technical Design

packages/
  dashboard/
    src/
      server.ts       # Express server, serves static build + /api/results
      index.tsx       # React SPA entry point
      components/
        FindingsTable.tsx
        SeverityChart.tsx
        FindingDetail.tsx
        FileHeatmap.tsx
    package.json

CLI Integration

chainproof scan contracts/ --format json --output results.json
chainproof dashboard results.json
# Opens browser to http://localhost:4242

Acceptance Criteria

• packages/dashboard scaffold with Express + React + Vite
• Findings table with severity filter and sort
• Severity summary chart (Chart.js or Recharts)
• Finding detail panel with code snippet
• chainproof dashboard <results.json> CLI subcommand
• Auto-opens browser on server start
• Accessible: keyboard navigable, ARIA labels on interactive elements
• Builds to static HTML for offline sharing (chainproof dashboard --export report.html)