Make clearStoredTeamIfMatches perform an atomic conditional UPDATE
so a concurrent team switch isn't clobbered, and call it for the
deleting owner in DeleteTeam so their stored team id doesn't point
at a deleted team. refreshSession now falls back to
resolveStoredTeam() instead of an arbitrary first team. Add a
return type to SelectTeam::render() and tests covering owner
deletion and concurrent-selection preservation.
Add current_team_id to users so the last active team is restored on
login instead of always defaulting to the personal team. When a user
belongs to multiple teams and has no valid stored choice, redirect
them to a new team.select screen (SelectTeam Livewire component) to
pick one, rather than silently choosing the first team. Update
Fortify and OAuth login flows to use the new resolveStoredTeam()
logic.
