[T2.14] Fix StorylineSprintBanner lint error

[realproject7]

Epic: #1229 · Type: CODE · Estimate: 0.05 day (~5 min) · Priority: Low (lint cleanup, not blocking)

Issue

src/components/airdrop/StorylineSprintBanner.tsx:19 — lint error per RE1 r40 verification (npm run lint reports it; specific error TBD upon investigation but file location confirmed).

Fix

Run npm run lint locally, identify the error, fix it. Likely candidates:

• Unused variable
• Missing dependency in useEffect
• Unsafe any type

Acceptance

• npm run lint no longer reports errors in StorylineSprintBanner.tsx
• (Note: npm run lint has separate errors from contracts/lib/ vendored code — those are unrelated and handled by T2.12's Foundry fix)

Found via

RE1 round-40 audit (npm run lint failed; airdrop-specific portion isolated to this file).

[realproject7]

Already fixed in PR #1307 (#1303) — StorylineSprintBanner was restructured to avoid sync setState in useEffect. Verified: npx eslint src/ returns zero errors/warnings on latest main.