[T3.8] Storyline page integration (banner + ref preservation)

[realproject7]

Epic: #1229 · Spec: §7.5 · Type: CODE · Estimate: 0.5 day · Depends on: T0.1

Visual reference

📐 Final v5 design: z-design/plotlink-airdrop-final.html — storyline banner pattern, dismiss UX

Scope

(a) Add StorylineSprintBanner.tsx

Small dismissible banner on storyline pages with:

• "PlotLink Buy-Back Sprint · Day X/90 · current FDV"
• CTA to /airdrop
• Dismiss button (localStorage flag)
• Recommended: bottom of page, low-profile (don't clutter reading UX per §7.5)
• Style per z-design/plotlink-airdrop-final.html

(b) Confirm Share button preserves ?ref=CODE

Storyline share buttons should append the user's ref code to share URLs if the user has one. Existing v1 hook (useReferralCapture) likely handles capture; verify share-out side.

(c) Confirm "Browse storylines" link target

The /airdrop page has a "Browse storylines →" CTA. Target page is T0.1 operator decision (e.g., /stories, /explore, or /). Read from T0.1 issue comment.

Acceptance

• Banner renders on storyline pages, dismissible, low-profile per z-design/plotlink-airdrop-final.html
• Share button URL contains ?ref=CODE when user has a ref code
• "Browse storylines" CTA on /airdrop points at T0.1-decided target

Dependencies

T0.1 (browse-storylines link target decision)