fix: add loading state in wearable backpack

[lorenzo-ranciaffi]

Pull Request Description

What does this PR change?

Test Instructions

Prerequisites

• List any required setup steps
• Include environment/configuration requirements

Test Steps

1. First step
2. Second step
3. Expected result after step 2
4. ...

Additional Testing Notes

• Note any edge cases to verify
• Mention specific areas that need careful testing
• List known limitations or potential issues

Quality Checklist

• Changes have been tested locally
• Documentation has been updated (if required)
• Performance impact has been considered
• For SDK features: Test scene is included

Code Review Reference

Please review our Code Review Standards before submitting.

[github-actions]

New build in progress, come back later!