feat: companies CRUD with person dialog integration and navigation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

api/app/Policies/CompanyPolicy.php

@@ -16,6 +16,16 @@ final class CompanyPolicy
             || $organisation->users()->where('user_id', $user->id)->exists();
     }
 
+    public function view(User $user, Company $company, Organisation $organisation): bool
+    {
+        if ($company->organisation_id !== $organisation->id) {
+            return false;
+        }
+
+        return $user->hasRole('super_admin')
+            || $organisation->users()->where('user_id', $user->id)->exists();
+    }
+
     public function create(User $user, Organisation $organisation): bool
     {
         return $this->canManageOrganisation($user, $organisation);