gahusb 559ca8d934 fix: tighten codex hint visibility and constants (A-5 polish)
- Hoist MAX_UNDISCOVERED_PER_TIER to module scope (was a local const that
  expressed game-design intent, not runtime state).
- Filter undiscovered slots to those with at least one known ingredient
  so a fresh player never sees useless `? + ?` cards on high tiers.
- Move card-level opacity off the wrapper so the recipe-hint span can
  stay full-color (especially the craftable-now blue) while sprite +
  name remain dimmed.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
2026-05-04 04:18:32 +09:00
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