Calendar list event items should be entirely clickable

Summary: Ref T8248, Calendar list event items should be entirely clickable

Test Plan: Open month view, verify that adjusting screen correctly adjust widths of event links, and that entire event row links are clickable.

Reviewers: chad, epriestley, #blessed_reviewers

Reviewed By: epriestley, #blessed_reviewers

Subscribers: Korvin, epriestley

Maniphest Tasks: T8248

Differential Revision: https://secure.phabricator.com/D12925