Roles, birthdays, and tighter navigation

Highlights

• Company role catalog lives under /admin/company - add, rename, color, and delete roles in one place.
• Activity card now tracks birthdays alongside work anniversaries for the whole week, one row per person, with a "today / in N days / N days ago" countdown.
• Shift detail shows a "Working with you" card listing coworkers whose shifts overlap yours that day.

Changes

Features

• feat(company-roles): catalog management in the admin company page.
• feat(employees): drop the Job role select - new staff inherit the company's default catalog role.
• feat(dashboard): weekly birthdays + anniversaries with one row per person; cards capped at a fixed height with internal scroll.
• feat(staff): show coworkers overlapping a shift on the detail page.

Fixes

• fix(nav): back button now navigates to the parent URL instead of bouncing through browser history.
• fix(timesheets): approval syncs the linked shift's times so the staff /my view reflects approved hours.
• fix(auth): logout races a 2s deadline so a stalled fetch can no longer freeze the menu.

Refactors

• refactor(admin): consolidate /admin/people into /admin/employees - one canonical route.

Chores

• chore(ui): clearer placeholders and pointer cursor for every interactive Radix role.
• docs(agents): document the publish-to-production workflow.