[UX] DonateWidget — show author name/address instead of story #ID

[realproject7]

Problem

DonateWidget shows "Donating X WETH to story #2" — but donations go to the author, not the story. Should show the author's identity.

Expected behavior

Replace story #2 with the author's display name or truncated address:

• If Farcaster identity available: Donating 0.001 WETH to @username
• Fallback: Donating 0.001 WETH to 0x0175...4dBf

Also update the subtitle: "Tip the author directly with WETH" is correct but could reinforce who the author is.

Acceptance Criteria

• DonateWidget receives author address (and optionally display name) as prop
• Confirmation text shows author name/address instead of "story #X"
• Truncated address format: 0x0175...4dBf (first 6 + last 4)
• If Farcaster display name is available from storyline data, prefer that

Files

• src/components/DonateWidget.tsx — update props and display text
• src/app/story/[storylineId]/page.tsx — pass author address/name to DonateWidget