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/services/app_settings.service.dart

@@ -35,6 +35,7 @@ enum AppSettingsEnum<T> {
   loopVideo<bool>(StoreKey.loopVideo, "loopVideo", true),
   loadOriginalVideo<bool>(StoreKey.loadOriginalVideo, "loadOriginalVideo", false),
   autoPlayVideo<bool>(StoreKey.autoPlayVideo, "autoPlayVideo", true),
+  tapToNavigate<bool>(StoreKey.tapToNavigate, "tapToNavigate", false),
   mapThemeMode<int>(StoreKey.mapThemeMode, null, 0),
   mapShowFavoriteOnly<bool>(StoreKey.mapShowFavoriteOnly, null, false),
   mapIncludeArchived<bool>(StoreKey.mapIncludeArchived, null, false),