Achievements & Badges — gamification rewards system

[Empreiteiro]

Description

Introduce an achievements/badges system that rewards players for reaching milestones and performing notable feats across battles.

Proposed Badges

Badge	Name	Condition
🩸	First Blood	Win your first battle
🏆	Champion	Win 10 battles
🐶	Underdog	Win a battle while having fewer public votes
🔥	On Fire	Win 3 battles in a row (streak)
👑	Dominator	Finish a battle with 90%+ territory
💀	Flawless	Win a battle where opponent scored 0
⚔️	Challenger	Accept and win a 1v1 challenge (waiting battle)
🌍	Social Butterfly	Participate in 10+ battles
📝	Committer	Accumulate 1000+ commits across all battles
🔀	PR Machine	Accumulate 100+ pull requests across all battles
👀	Reviewer	Accumulate 50+ code reviews across all battles
🎯	Sniper	Win a battle by 1 point margin
🏟️	Arena Master	Create 10 battles

Details

• Badge display: Show earned badges on the global leaderboard player cards (depends on Global Leaderboard — all-time player rankings #1)
• Badge notification: Toast/popup when a badge is earned at the end of a battle
• Storage: Player badge data stored in Netlify Blobs alongside leaderboard data
• Badge page: /badges route showing all available badges with locked/unlocked state

Acceptance Criteria

• Badge definitions and unlock conditions implemented
• Badges evaluated at battle completion
• Visual badge icons displayed on player profiles
• Notification when a new badge is earned
• /badges page showing all badges with descriptions