fix(graph): stop repeated enumeration cursors

[rishibalakrishnan]

Summary

• fetch one extra raw follow or list-member row so terminal pages omit the cursor
• refill getFollows and getList after moderation/hydration filtering, with a bounded repeated-cursor guard
• keep the change scoped to following and list-member enumeration; starter-pack members use the list-member path

Problem

The AppView could return the final account together with a cursor pointing back to that same tail. Subsequent requests then repeated the account indefinitely. This was reproduced against jama.com, where Jason Nagata appeared repeatedly after the first page.

Verification

• regression test failed before the fix on the terminal cursor
• 37 focused follow/list integration tests pass, including real filtering/refill cases
• 3 fillPage unit tests pass
• AppView build/typecheck passes
• focused ESLint passes
• full Prettier check and git diff --check pass
• independently reviewed by Fable and Sol with no blocking findings

Scope

This PR intentionally does not change followers, actor-list enumeration, starter-pack search, or unrelated pagination endpoints.