[C2] Attendance creation process issues

[ywarnier]

In C2, 2 issues remain in the attendance tool:

• When creating an attendance sheet, the process leads us immediately to the creation of a first date of attendance. However, the button to save the configured attendance doesn't react. Something seems stuck. This works well when creating the date afterwards.
• During the same creation process (not after that), the breadcrumb shows the title of the attendance sheet in normal fonts without link, and the name of the form (Add calendar) in bold with a link. It should be reversed : the attendance sheet title should be a link to the sheet (and it should show automatically in bold if it's a link) and the title of the current form should not be a link (and should show as non-bold text)
• In that same date addition form, the "Duration" field is embedded into a square border block. It should just be the element with rounded corners

[ywarnier]

First point solved by #6895