[Feature Request]: Toggle to hide pro elements

### Feature Description

Please add a toggle to hide all "pro" / upgrade elements.

### Use Case

To hide elements such as:
- Upgrade button
- "You ran out of Pro search" popup
- Search button
- Research button
- Labs button
- "Open on the Perplexity mobile app | Scan now to install"
- etc.

### Alternatives Considered

_No response_