[#475] Farcaster manifest + SDK integration

[realproject7]

Parent: #475

Depends on: #476 (needs deployed URL — done)

Summary

Complete the Farcaster mini-app integration. Current manifest has empty account association fields.

Screenshots available

Uploaded to /public/:

• screenshot-1.png — Home page ("Write Stories. Trade Them.")
• screenshot-2.png — Story detail ("Every Plot Moves the Market")
• screenshot-3.png — Writer dashboard ("Every Trade Pays the Writer")

These need to be committed to main before deployment.

Steps

1. Commit screenshots

Add screenshot-1.png, screenshot-2.png, screenshot-3.png to git.

2. Complete Farcaster manifest

Update public/.well-known/farcaster.json:

• accountAssociation — OPERATOR provides these after signing with custody key for plotlink.xyz domain (leave empty for now, operator fills in [#475] OPERATOR GATE: Domain DNS, Vercel secrets, Base.dev, Farcaster association #480)
• splashBackgroundColor: change from #0a0a0a to #E8DFD0 (current warm theme)
• Add missing fields:
  • subtitle: "Write Stories. Trade Them."
  • heroImageUrl: "https://plotlink.xyz/og-image.png"
  • tagline: "Tokenise your story from day one"
  • ogTitle: "PlotLink"
  • ogDescription: "Tokenise your story from day 1. Publish plots, drive trading, earn royalties from every trade."
  • screenshotUrls: ["https://plotlink.xyz/screenshot-1.png", "https://plotlink.xyz/screenshot-2.png", "https://plotlink.xyz/screenshot-3.png"]
  • requiredCapabilities: ["wallet.getEthereumProvider", "actions.swapToken"]
• Add baseBuilder.ownerAddress field (operator provides address in [#475] OPERATOR GATE: Domain DNS, Vercel secrets, Base.dev, Farcaster association #480)

3. SDK ready() call

Reference: ~/Projects/dropcast/components/providers/FrameProvider.tsx

• Ensure sdk.actions.ready() is called on mount when inside Farcaster/Base App
• Check src/components/FarcasterMiniApp.tsx — verify it handles this correctly

4. Share to Farcaster

• Verify "Share to Farcaster" functionality on story pages uses sdk.actions.composeCast()
• Verify fc:miniapp meta tags on story pages for rich embeds

Acceptance Criteria

• Screenshots committed
• Manifest updated with all fields (except accountAssociation — operator gate [#475] OPERATOR GATE: Domain DNS, Vercel secrets, Base.dev, Farcaster association #480)
• sdk.actions.ready() fires correctly in mini app context
• Splash background matches current theme
• Share to Farcaster works

Branch

task/477-farcaster-setup in plotlink repo