Add the coverage page

[theosiemensrhodes]

Add a dedicated Coverage Requests page (separate from the schedule calendar) for coverage-related workflows.

Access

• Volunteers: can view the page.
• Admins: can view the page.
• Instructors: cannot access (hidden in nav + server-side protection).

What it shows

Volunteers see:

• All shifts up for coverage.
• Their own shifts that were taken by another volunteer (their request was filled).
• Volunteers do not see why a shift was put up for coverage on the sidebar

Admins see:

• All shifts in any coverage-related state.

• Admins see all information like the figma displays.

• Actions (Volunteers)

• Can take someone else’s coverage request (cover the shift). clientApi.coverage.fillCoverageRequest

• Can withdraw their own coverage request (when not filled). clientApi.coverage.cancelCoverageRequest

Notes:

• This page is very similar to the list portion of the schedule page, so you can check there for information
• The figma is generally correct but many specifics are wrong. i.e. there are not 2 tabs for coverage/absence and on the figma it assumes all viewers are admins which is wrong.
• The function to fetch coverage requests is not implemented yet. For now fake data can be used until Create the coverage.list route #146 is implemented.