feat: tap to see next/previous image (#20286)

* feat(mobile): tap behavior for next/previous image

This change enables switching to the next/previous photo in the photo
viewer by tapping the left/right quarter of the screen.

* Avoid animation on first/last image

* Add changes to asset_viewer.page

* Add setting for tap navigation, disable by default

Not everyone wants to have tapping for next/previous image enabled, so
this commit adds a settings toggle. Since it might be confusing behavior
for new users, it is disabled by default.

* chore: refactor

* fix: lint

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/lib/domain/models/store.model.dart

@@ -73,6 +73,9 @@ enum StoreKey<T> {
   autoPlayVideo<bool>._(139),
   albumGridView<bool>._(140),
 
+  // Image viewer navigation settings
+  tapToNavigate<bool>._(141),
+
   // Experimental stuff
   photoManagerCustomFilter<bool>._(1000),
   betaPromptShown<bool>._(1001),