fix(user): complete User model fixes for non-web contexts

- Fix currentTeam() to return null instead of crashing when no session
- Fix role() to use $this->currentTeam() instead of global helper
- Add roleInTeam() method for explicit team context
- Remove unused otherTeams() method
- Fix InviteLink authorization bypass when role() returns null
- Fix confirmEmailChange() null safety for currentTeam()
- Fix ActivityMonitor to handle null currentTeam with fallback chain

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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/Livewire/Team/InviteLink.php

@@ -48,7 +48,7 @@ class InviteLink extends Component
 
             // Prevent privilege escalation: users cannot invite someone with higher privileges
             $userRole = auth()->user()->role();
-            if ($userRole === 'member' && in_array($this->role, ['admin', 'owner'])) {
+            if (is_null($userRole) || ($userRole === 'member' && in_array($this->role, ['admin', 'owner']))) {
                 throw new \Exception('Members cannot invite admins or owners.');
             }
             if ($userRole === 'admin' && $this->role === 'owner') {