fix(team): resolve stored team on deletion and impersonation

Use resolveStoredTeam() instead of teams()->first() when picking the
next active team after a team deletion or when an admin switches into
a user's account, so a valid stored preference wins over an arbitrary
first team. DeleteTeam now returns null when the deletion leaves the
owner with multiple teams, deferring to the selection screen instead
of guessing. refreshSession also stops persisting current_team_id
while impersonating, so viewing another user's account no longer
overwrites their real last-active team.

app/Actions/Team/DeleteTeam.php

@@ -60,7 +60,12 @@ class DeleteTeam
 
             $team->delete();
 
-            return $user->teams()->first();
+            // Resolve the next active team the same way login does: the user's
+            // stored choice when still valid, or their sole remaining team.
+            // Returns null for a multi-team user whose active team was just
+            // deleted, so refreshSession sends them to the selection screen
+            // instead of silently dropping them into an arbitrary first team.
+            return User::query()->find($user->id)?->resolveStoredTeam();
         });
 
         Cache::forget("user:{$user->id}:team:{$team->id}");

app/Livewire/Admin/Index.php

@@ -33,7 +33,7 @@ class Index extends Component
         if (session('impersonating')) {
             session()->forget('impersonating');
             $user = User::find(0);
-            $team_to_switch_to = $user->teams->first();
+            $team_to_switch_to = $user->resolveStoredTeam() ?? $user->teams->first();
             Auth::login($user);
             refreshSession($team_to_switch_to);
 
@@ -69,7 +69,7 @@ class Index extends Component
         if (! $user) {
             abort(404);
         }
-        $team_to_switch_to = $user->teams->first();
+        $team_to_switch_to = $user->resolveStoredTeam() ?? $user->teams->first();
         Auth::login($user);
         refreshSession($team_to_switch_to);