[feat] Show Farcaster identity on plot pages instead of truncated address

[realproject7]

Problem

The plot detail page (src/app/story/[storylineId]/[plotIndex]/page.tsx) and the OG image route (src/app/story/[storylineId]/og/route.tsx) display the author as a truncated hex address (e.g., 0x4d68...b6c8).

The storyline page already resolves and displays the author's Farcaster identity via <WriterIdentity> — this should be applied to plot pages too.

Scope

1. Plot page (src/app/story/[storylineId]/[plotIndex]/page.tsx, line 107): Replace truncateAddress(sl.writer_address) with <WriterIdentity address={sl.writer_address} /> wrapped in <Suspense> (same pattern as storyline page line 197-198)
2. OG image (src/app/story/[storylineId]/og/route.tsx, line 106): Resolve Farcaster fname server-side if available, fall back to truncated address

Reference

• Existing pattern: src/app/story/[storylineId]/page.tsx:197-198
• Component: src/components/WriterIdentity.tsx
• Client component: src/components/WriterIdentityClient.tsx