Limit Pro to 3 branches and leave Business unlimited.

Enforce plan location caps in SubscriptionService, surface upgrade
copy on plans and branch settings, and cover the limits in tests.

tests/Feature/PosMultiBranchTest.php

@@ -47,6 +47,20 @@ class PosMultiBranchTest extends TestCase
         ]);
     }
 
+    private function activateBusiness(User $user): void
+    {
+        ProSubscription::create([
+            'user_id' => $user->id,
+            'plan' => ProSubscription::PLAN_ENTERPRISE,
+            'status' => ProSubscription::STATUS_ACTIVE,
+            'price_minor' => 24900,
+            'currency' => 'GHS',
+            'auto_renew' => true,
+            'started_at' => now(),
+            'current_period_end' => now()->addMonth(),
+        ]);
+    }
+
     protected function setUp(): void
     {
         parent::setUp();
@@ -104,6 +118,58 @@ class PosMultiBranchTest extends TestCase
         $this->assertSame(2, PosLocation::owned($owner->public_id)->count());
     }
 
+    public function test_pro_account_cannot_add_fourth_branch(): void
+    {
+        $owner = $this->owner();
+        $this->activatePro($owner);
+
+        foreach (['Main', 'Mall', 'Airport'] as $i => $name) {
+            PosLocation::create([
+                'owner_ref' => $owner->public_id,
+                'name' => $name,
+                'currency' => 'GHS',
+                'is_default' => $i === 0,
+            ]);
+        }
+
+        $this->assertSame(3, PosLocation::owned($owner->public_id)->count());
+
+        $this->actingAs($owner)
+            ->post(route('pos.branches.store'), [
+                'name' => 'Fourth branch',
+                'currency' => 'GHS',
+                'service_style' => 'retail',
+            ])
+            ->assertRedirect(route('pos.pro.index'));
+
+        $this->assertSame(3, PosLocation::owned($owner->public_id)->count());
+    }
+
+    public function test_business_account_can_add_beyond_three_branches(): void
+    {
+        $owner = $this->owner();
+        $this->activateBusiness($owner);
+
+        foreach (['Main', 'Mall', 'Airport'] as $i => $name) {
+            PosLocation::create([
+                'owner_ref' => $owner->public_id,
+                'name' => $name,
+                'currency' => 'GHS',
+                'is_default' => $i === 0,
+            ]);
+        }
+
+        $this->actingAs($owner)
+            ->post(route('pos.branches.store'), [
+                'name' => 'Fourth branch',
+                'currency' => 'GHS',
+                'service_style' => 'retail',
+            ])
+            ->assertRedirect(route('pos.settings').'#branches');
+
+        $this->assertSame(4, PosLocation::owned($owner->public_id)->count());
+    }
+
     public function test_cashier_is_limited_to_assigned_branch_sales(): void
     {
         $owner = $this->owner();