[T3.7] Delete StreakCard, WeeklySnapshots; reduce CampaignHero

[realproject7]

Epic: #1229 · Spec: §6.2, §6.4 · Type: CODE · Estimate: 0.5 day · Depends on: T3.1

Visual reference

📐 Final v5 design: z-design/plotlink-airdrop-final.html — confirm CampaignHero compact top-strip styling

Scope

Delete (file + import)

• src/components/airdrop/StreakCard.tsx
• src/components/airdrop/WeeklySnapshots.tsx

Heavy reduce

• src/components/airdrop/CampaignHero.tsx → compact top strip only: "Day X/90 · current FDV · next milestone"
• v5 hero copy lives in Pre-activation state's main content area (T3.1), NOT in this component
• Top-strip styling per z-design/plotlink-airdrop-final.html

Verify

• Grep for any remaining imports of deleted components
• Leaderboard component already removed from main page in T3.1

🚨 SEQUENCING CONSTRAINT (RE1 round-12 mitigation)

Single PR / single commit must include BOTH:

1. Component file deletions (StreakCard.tsx, WeeklySnapshots.tsx)
2. All import removals in src/app/airdrop/page.tsx + any other consumer file

Why: deleting component files first without updating consumers causes TS build error → /airdrop page becomes 500 error on the next deploy. Both must land atomically.

Audit grep before commit:

grep -rn "StreakCard\|WeeklySnapshots" src/ --include="*.tsx" --include="*.ts"
# Should return 0 results AFTER all edits are staged

If git status shows component files deleted but page.tsx not modified → DO NOT COMMIT. Fix imports first.

Acceptance

• Both deleted files no longer exist
• No broken imports remain (verified by grep returning 0 results)
• npm run build passes locally before push
• CampaignHero renders compact 1-line strip per z-design/plotlink-airdrop-final.html
• PR is single commit OR single merge — no intermediate broken state on main
• Build passes on Vercel staging immediately after merge

Dependencies

T3.1 (#1250 — removes top-level imports from page.tsx). T3.1 should already be merged before T3.7 to ensure clean diff.