R1:dcf3ca8e0450

When a user clicks a navigation link in a dialog, close the dialog

Summary:
Ref T13302. Currently, if you enable Quicksand (by clicking "Persistent Chat"), open a dialog with links in it (like "Create Subtask" with multiple available subtypes), and then follow a navigation link, the page content reloads behind the dialog but the dialog stays in the foreground.

Fix this by closing dialogs when users click navigation links inside them.

Test Plan:
With Quicksand enabled and disabled, clicked a subtask type…