fix(mobile): contest followers screen blank when limit exceeds 100

[dylanjeffers]

Summary

The mobile Contest Followers screen (the dedicated list opened from the
"FOLLOWERS (N)" card on a remix contest page) was rendering as a blank
white screen under its "FOLLOWERS" header — no rows, no skeletons, no empty
state.

Root cause: the screen requested useEventFollowers({ eventId, limit: 200 }),
while the equivalent web caller (ContestFollowersModal) uses limit: 100.
Above that ceiling the /events/{eventId}/followers response comes back
empty, so userIds resolved to [], isPending flipped to false, and the
shared UserList rendered nothing.

The avatar pile on the contest details tab kept working because it requests
limit: 7 via EventFollowersCard, well under the ceiling.

Fix

• ContestFollowersScreen.tsx now requests limit: 100, matching the web modal.
• Updated the surrounding docstring to record why we hold at 100 so future
  readers don't bump it back up.

Test plan

• Open a remix contest with a few followers on mobile
• Tap the "FOLLOWERS (N)" card on the details tab
• Confirm the dedicated screen now lists the follower rows instead of
  rendering a blank "FOLLOWERS" header
• Confirm the avatar pile on the details tab still renders (limit 7,
  unchanged path)
• Web: confirm the ContestFollowersModal is unaffected (no changes
  touched the hook or the web caller)

🤖 Generated with Claude Code

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