Hover hint on calendar list items should appear on the most convenient side of the item

Summary: Hover hint on calendar list items should be to the right in day view, left in profile view, on top in month view

Test Plan: Open profile view, calendar items should have a left hover. Open day view, calendar items should have a right hover. Open month view, calendar items should have top hover.

Reviewers: epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin

Maniphest Tasks: T9606

Differential Revision: https://secure.phabricator.com/D15964