R1:4485482fd4cc

Fix task hovercards showing a "Not Editable" state

Summary:
Ref T13269. These cards really have three states:

- Editable: shows a pencil icon edit button.
- You Do Not Have Permission To Edit This: shows a "no editing" icon in red.
- Hovecard: shouldn't show anything.

However, the "hovercard" and "no permission" states are currently the same state, so when I made the "no permission" state more obvious that made the hovercard go all weird.

Make these states explicitly separate states.

Test Plan…