feat(rewards): surface achievement token rewards and fix rewards page display

[YellowSnnowmann]

Summary

Rewards page: fix achievement display issues and surface the per-achievement token
reward now granted by the backend.

Changes

Display fixes:

• Render one progress badge per achievement (was hard-capped at 8, silently hiding
  3 of the 11 achievements).
• Split the single stats block into two cards — Discord status vs. product activity —
  so Discord and platform metrics are no longer conflated.
• Clarify the streak: "Activity streak", "{n} days" unit, an explanatory hint, and a
  Longest streak row.
• Surface the backend per-achievement progress label ("3 / 7 active days", etc.),
  which was computed but never rendered.
• "Roles assigned" now counts assignable achievements (unlocked + role-configured)
  instead of all unlocked, so the ratio can't misreport (e.g. "3 of 4" for a role
  that can never be granted).

Token rewards:

• Show the reward per achievement as a pill (+500K tokens, +5M tokens/mo for
  subscriber tiers), with compact formatting.
• Add rewardTokens / rewardRecurring to the RewardsAchievement type + API
  normalizer.

i18n:

• New keys added to en.ts and all 13 locale files (parity kept); brand key allowlisted
  in the English-drift check.

Testing

• Vitest rewards suite green (component, page, api, slice). typecheck / eslint /
  prettier / i18n parity clean.

Notes

• Backend counterpart: token rewards credited as USD promo (tinyhumansai/backend).
• Could be split into two PRs (display fixes vs. token-reward surfacing) if preferred —
  they share the same files.

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📥 Commits

Reviewing files that changed from the base of the PR and between 6e17240 and 1f45f4b.

📒 Files selected for processing (24)

• app/src/components/rewards/RewardsCommunityTab.tsx
• app/src/components/rewards/__tests__/RewardsCommunityTab.test.tsx
• app/src/lib/i18n/ar.ts
• app/src/lib/i18n/bn.ts
• app/src/lib/i18n/de.ts
• app/src/lib/i18n/en.ts
• app/src/lib/i18n/es.ts
• app/src/lib/i18n/fr.ts
• app/src/lib/i18n/hi.ts
• app/src/lib/i18n/id.ts
• app/src/lib/i18n/it.ts
• app/src/lib/i18n/ko.ts
• app/src/lib/i18n/pl.ts
• app/src/lib/i18n/pt.ts
• app/src/lib/i18n/ru.ts
• app/src/lib/i18n/zh-CN.ts
• app/src/pages/__tests__/Rewards.test.tsx
• app/src/services/api/__tests__/rewardsApi.test.ts
• app/src/services/api/rewardsApi.ts
• app/src/store/__tests__/rewardsSlice.test.ts
• app/src/types/rewards.ts
• app/test/e2e/specs/rewards-progression-persistence.spec.ts
• app/test/playwright/specs/rewards-progression-persistence.spec.ts
• scripts/i18n-find-english.ts

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