Epic: Deck Builder

[Doberjohn]

Goal

Add a full deck building experience with synergy analysis integration — Inkweave's core differentiator.

Scope (v1.0)

• Card add/remove with quantity controls
• Rule enforcement: 4-copy max, 2-color max (60-card soft limit — allow more, show warning)
• Local persistence (localStorage) — multiple decks, auto-save
• Dreamborn text format import / text export
• Deck synergy analysis via CTA button (client-side, weighted sum scoring)

Architecture Notes

• Entirely client-side (no backend needed)
• Synergy analysis uses pre-computed synergy JSON files (already exist per card)
• Weighted sum formula: Perfect (9-10) ×3, Strong (7-8) ×2, Moderate (4-6) ×1, Weak (<4) ×0.5
• Display: single deck synergy score number for v1.0, breakdown in future versions

Sub-tasks

• Deck Builder UI + Validation #206 — Deck Builder UI + Validation
• Deck Local Persistence #207 — Deck Local Persistence
• Dreamborn Import / Text Export #208 — Dreamborn Import / Text Export
• Deck Synergy Analysis #209 — Deck Synergy Analysis

Phase

Phase 2 (weeks 3-4) — depends on engine rules landing first for richer analysis

Future Enhancements (post-v1.0)

• Deck sharing via URL (Deck sharing via URL #2)
• Synergy breakdown by playstyle
• "Cards that would improve your deck" suggestions
• Per-pair detail view within deck context