ASSET_G-043: Skill & Progression Visuals

## Requirements
- Skill Icons (32x32): Combat, Crafting, Gathering, Survival, Social
- Achievement Badges (48x48): Bronze, Silver, Gold, Platinum, Diamond
- Level Up: Gold burst + number zoom (2s)
- Era Banner: 8 eras with unique colors

## Achievement Tiers
- Bronze: #CD7F32
- Silver: #C0C0C0
- Gold: #FFD700
- Platinum: #E5E4E2
- Diamond: #B9F2FF