Piefed poll posts aren't being displayed

**Describe the bug**
Piefed provides the option to create poll posts. They are different than normal text/link/image posts. These poll posts aren't being displayed in Voyager.

**To Reproduce**
Steps to reproduce the behavior:

1. Go to https://piefed.social/c/polls
2. Alternatively https://piefed.zip/c/polls@piefed.social (piefed.social is slow right now)
3. You'll see multiple poll posts in browser
4. They don't show up in Voyager

**Expected behavior**
Poll posts should show up and voting in polls should be possible. Creating polls directly from Voyager would be nice too.

**Smartphone (please complete the following information):**

- Device: Pixel 6a
- OS: Android 16
- Voyager Version: 2.37.2 (GitHub)