P2E: add player reward UI

[ilyar]

Source PRD: tasks/prd-full-play-to-earn.md
Parent epic: #86
PRD section: US-010

Description

Players need a clear reward interface showing progress, eligibility, claimable rewards, and payout status.

Acceptance Criteria

• Home/Profile shows active campaign, reward progress, current rank/tier, and claim eligibility status.
• Result screen shows reward point changes when a P2E campaign is active.
• Rewards page shows campaign rules, pool cap, personal progress, claimable rewards, payout status, and support link.
• UI distinguishes Season Points, reward points, claimable rewards, paid ELM, and demo tELM.
• UI does not promise guaranteed income, fast money, risk-free earning, or fixed earnings unless legally reviewed and factually supported.
• Verify in browser using Playwright.

Constraints

• Keep current paid PvP settlement as entry fee, not player-funded prize pool.
• Do not make Season Points redeemable or refundable.
• Keep payout/compliance/provider secrets backend-only.
• Treat this as deferred future-phase work until mechanics/self-host production readiness is stable.

Notes

Copy must avoid gambling and unsupported earnings language.