T3-027: Badge notification on earn

Track: 3 — Solana Phone / Web3
Section: Phase C: NFT Achievement Badges (72h)
Status: [ ] Todo
Repo: app-user
Branch: feature/T3-027-badge-earn-notification
Estimated Hours: 2h

Done When

Push notification when badge earned: "You earned the 7-Day Streak badge!" Tap -> achievement screen

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