Harden per-branch billing with seat caps and mid-cycle expansion.

Enforce billed_branches when adding or reactivating branches, charge
wallet for extra seats mid-cycle, fix Settings for Enterprise, and
cover multi-branch checkout and renewal amounts in tests.

app/Http/Controllers/Frontdesk/SettingsController.php

@@ -43,7 +43,11 @@ class SettingsController extends Controller
             'notificationEvents' => config('frontdesk.notification_events'),
             'plan' => $plan,
             'isPro' => $plans->isPro($organization),
-            'proPriceMinor' => $plans->proPriceMinor(),
+            'isEnterprise' => $plans->isEnterprise($organization),
+            'hasPaidPlan' => $plans->hasPaidPlan($organization),
+            'billedBranches' => $plans->billedBranches($organization),
+            'activeBranchCount' => $plans->activeBranchCount($organization),
+            'proPriceMinor' => $plans->proPricePerBranchMinor(),
             'monthlyUsage' => $monthlyUsage,
             'freeEmailAllowance' => $freeEmailAllowance,
             'emailCostFormatted' => $pricing->formatMinor($pricing->emailCostMinor()),