Several improvements to the chapter view

[smadbe]

Overview

Several improvement to the access to the "chapter view".
One of the problem is (as the usual user): go from this group observation page and leave observation -> blank page

Another "problem" is to call that "chapter view" in observation on non chapters.

In my opinion, we should have a single path url which displays something different depending on the case and prevent the blank screen.

4 cases:

• not observing or observing a single user:
  • on a task: display chapter-user-progress. The selector is named "Chapter view". The selector is only shown if we are on the tab (disappear if we navigate to the history).
  • on a chapter: display chapter-user-progress. The selector is named "Chapter view". The selector is always shown.
• observing a group
  • on a task: display chapter-group-progress. The selector is named "Grid view". The selector is always shown.
  • on a chapter: display chapter-group-progress. The selector is named "Grid view". The selector is always shown.

Acceptance criteria

• Have a single url as described
• Have the right selector title as described
• Have the selector title disappear in case 1