[FEATURE REQUEST] Icon for QuickAdd on mobile toolbar

[mfloreen]

Is your feature request related to a problem? Please describe. Currently, when adding a button for QuickAdd to the mobile toolbar, it uses the default question mark symbol, which is not very useful.

Describe the solution you'd like It would be great if this could use a more useful symbol, such as the "plus page" icon used in the desktop ribbon menu.

Additional context I've noticed this on Obsidian for iOS. Screenshot below.