Show previous scrambles for completed solves

Users should be able to view scrambles associated with completed solves.

Feedback source:
- Viewing previous solves' scrambles.
- Add ability to see previous scrambles.
- Put scrambles to be seen after having done the solve.
- Not allowing a solver to access a scramble they have previously done in the timing area, while still being able to access it in chat/history.

Acceptance ideas:
- Store/display the scramble for each completed attempt.
- Make previous scrambles accessible from result history or solve details.
- Keep completed scramble review separate from the active timing area.
- Define behavior when a room expires or is deleted.