7f65f4aabd
The hidden "Assign to me" button on the card detail view baked
Current.user.id into the form action at render time. When served from
fragment cache, a stale user ID could be embedded, assigning cards to
the wrong person.
Switch to card_self_assignment_path which resolves the current user at
request time via SelfAssignmentsController, matching the fix already
applied to the board view in 2527f073.
ref: https://app.fizzy.do/5986089/cards/3722