feat(polls): truncate long polls to 4 options with expand toggle

[dmnyc]

Summary

• Polls with more than 4 options now collapse to show just the first 4, matching how long text posts are truncated in the feed
• A centered "N more options" pill button expands the full list; tapping again collapses back to "Show fewer"
• Applies to both NIP-88 (kind 1068) standard polls and NIP-69 (kind 6969) zap polls
• Works in both voting mode (pre-vote) and results mode (post-vote / ended)
• Multi-choice pending selections in hidden options are preserved across expand/collapse — they count toward the Vote button as normal

Details

PollSection.collapsedOptionCount = 4. The expand toggle is animated (.easeInOut(duration: 0.2)) and uses the same visual style as the "Show more" / "Show less" button on long text posts.

Screenshots

Before

After

Test plan

• Open a poll with ≤ 4 options — no truncation, no button
• Open a poll with > 4 options — first 4 visible, "N more options" button shown
• Tap "N more options" — all options expand with animation
• Tap "Show fewer" — collapses back to 4
• Verify with a zap poll (kind 6969) with > 4 options
• Verify results mode (after voting or on an ended poll) truncates the same way