Is your feature request related to a problem? Please describe.

Spam messages are generally bulk-deleted (even after reviewing and moving false positives to another folder). Thus, there's an extra tap involved when having to Select All and then Delete messages in the Spam folder.

Describe the solution you'd like

A single-tap Empty Spam action (even in the overflow menu would be fine). This would be akin to Thunderbird's Empty Junk action when right-clicking the folder that's designated as the Junk folder in T-bird.

Describe alternatives you've considered

Can't think of any alternatives that wouldn't make this any more complicated than it needs to be.

Additional context
Add any other context or screenshots about the feature request here.

Rough mock-up: