- Equipment system: 12 items across weapon/armour/trinket slots with
common/rare/epic/legendary rarities; starter commons auto-equipped,
higher tiers drop from boss victories
- Achievement system: 15 milestones with typed conditions; checked
each tick and crystal rewards applied automatically
- Achievement toast: slide-in notification, auto-dismisses after 4s
- Floating click text: +X gold floats on each manual click
- Expanded quests (9 total) and upgrades (12 total)
- Upgrade panel now shows locked upgrades so players can see their
progression path
- formatNumber utility (K/M/B/T) used consistently across all panels
- Backfill logic for existing saves to add new content gracefully
- types package now emits .d.ts declarations
