When a user has advanced-request permission, the season-select sheet
opened the advanced request modal via router.back() + push(). back() is
batched, so the push landed first and the advanced sheet stacked on top
of the season sheet, breaking focus. Add a `replace` option to
showRequestModal and use it here so the advanced modal takes the season
sheet's place in the stack.
Claude-Session: https://claude.ai/code/session_016Hhu5DruGLPhdP4LAoy1Xd
