Add Interactive Web Explorer for IPTF Map

[oskarth]

Problem

The IPTF Map contains 100+ markdown files (43 patterns, 17 use cases, 8 approaches, 6 domains, 7 jurisdictions, 19 vendors) with ~355 cross-reference links, but is only navigable as raw markdown in git. Three key personas need better navigation: business stakeholders, technical teams, and legal/compliance.

Proposal

Static web app generated from the markdown at build time (zero backend). Multiple views:

1. Galaxy View — force-directed knowledge graph with interactive relationships
2. Tree View — hierarchical flow: use cases → approaches → patterns
3. Browse View — search and filter card grid

Tech: Astro + React + D3.js, deployed to GitHub Pages.

MVP Scope

• Data pipeline: parse frontmatter + extract cross-references → graph.json (104 nodes, 355 edges)
• Three views with hover highlights, click-to-detail panel, filters
• 45 tests covering data extraction, layout logic, and integration
• See PR feat: interactive Privacy Map Explorer (MVP) #89

Future Work

• Full-text search
• Solution Finder wizard (domain → use case → approach → patterns → vendors)
• Compliance Lens (jurisdiction × domain matrix)
• Deep linking / shareable URLs
• Mobile responsive layout