Fix line-height for some events for mobile

What does this MR do?

Fix line-height for some events for mobile.

Are there points in the code the reviewer needs to double check?


While .event-title and .event-item-timestamp are tuned for PC in, .event-item-timestamp can be omitted for mobile as it is hidden:

Why was this MR needed?

While line-height is fine-tuned only for PC (!2715 (merged) EDIT: !1239 (merged)), it is not suitable for mobile.

Screenshots (if relevant)

before dashboard-activity-before
after dashboard-activity-after

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes #38778

Edited by username-removed-100770