[Bug]: Hat wearable doesn't appear when Top Head category item is already equipped

### Platform
iOS and Android

### App Version
Not specified

### Device Information
Not specified

### Issue Description
When equipping a hat while already having a "Top Head" category wearable equipped, the hat does not appear on the avatar. This suggests a category conflict or improper wearable replacement logic between the Hat and Top Head categories.

### Expected Behavior
When equipping a hat while a Top Head item is already equipped, one of the following should occur:
1. The hat should replace the Top Head item and display correctly, OR
2. The system should prompt the user about the conflict and allow them to choose which item to keep

Currently, neither happens - the hat simply doesn't show up.

### Steps to Reproduce
1. Equip a wearable from the "Top Head" category
2. Then equip a hat wearable
3. Observe that the hat does not appear on the avatar
4. The Top Head item remains visible instead

### Occurrence
100% of the time

Requested by ToxicWaifu via Slack