Confirm dialog on back button

**Is your feature request related to a problem? Please describe.**
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I'm frustrated when I'm pretty far down in the infinite scroll, and I accidentally hit the back button (gesture) and it loses my spot in the feed.

**Describe the solution you'd like**
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An option to set back button functionality to:
- back button/gesture twice to exit from the feed
- or a dialogue box to confirm
- or disabled (current functionality)

**Describe alternatives you've considered**
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Looked through the settings a few times and didn't find it. Sync has this feature and i think voyager would benefit

**Additional context**
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