[Bug]: Mobile avatar name tags display too low on Unity client with large wearables

## 🕹️Platform
Android

## 🔢App Version
55 - 46316a6

## 📱Device Information
Samsung Galaxy S10+

## 📄Issue description
When a user is logged in on the mobile client and viewed from the Unity client, their name tag appears positioned too low and goes through the avatar instead of displaying above it. This issue appears to be triggered by large wearables.

This is a cross-client compatibility bug where the mobile client and Unity client calculate name tag positions differently, especially when large wearables are involved.

**Affected wearable:** Fleeple

## ✅Expected behavior
The name tag should display above the avatar's head regardless of wearable size, positioned consistently across both mobile and Unity clients.

## 🖼️Screenshots / Media




## ▶️Steps to reproduce
1. Log in on mobile client (Samsung Galaxy S10+, version 55 - 46316a6)
2. Equip a large wearable such as Fleeple
3. View the same avatar from a Unity client
4. Observe that the name tag is positioned too low and goes through the avatar

## 👁️Occurrence
100% of the time

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**Related issues:**
- #1542 - Head Explode Emote Causes Player Name Tag to Increase Size (name tag scaling issue when avatar changes size)
- #1578 - Can't see my Mobile Avatar on Unity client (different cross-client avatar issue)

Requested by cheddarqueso3d via Slack