Improve campaign personalization and contact duplicate handling.

Add merge tags for email/SMS, paginated removable recipients, PCM event panels for postcard campaigns, and a portal modal when phone/address matches an existing contact.

site/contacts/tests_merge.py

@@ -1,3 +1,4 @@
+from django.contrib.auth import get_user_model
 from django.test import Client, TestCase
 from django.urls import reverse
 
@@ -152,3 +153,69 @@ class ContactFormMergeTests(TestCase):
         self.assertEqual(lead.contact_id, self.existing.pk)
         self.assertIn("alt@example.com", lead.message)
         self.assertIn("merged by phone", lead.message)
+
+
+class PortalCreateMatchPromptTests(TestCase):
+    def setUp(self):
+        User = get_user_model()
+        self.user = User.objects.create_user(
+            username="adder", password="test-pass-123"
+        )
+        self.client = Client()
+        self.client.login(username="adder", password="test-pass-123")
+        self.existing = Contact.objects.create(
+            email="primary@example.com",
+            phone="6301112222",
+            first_name="Alex",
+        )
+
+    def test_phone_match_shows_prompt(self):
+        url = reverse("contacts:create")
+        response = self.client.post(
+            url,
+            {
+                "first_name": "Alex",
+                "email": "alt@example.com",
+                "phone": "(630) 111-2222",
+                "consent_email": "1",
+            },
+        )
+        self.assertEqual(response.status_code, 200)
+        self.assertContains(response, "Possible duplicate")
+        self.assertContains(response, "Update existing")
+        self.assertEqual(Contact.objects.count(), 1)
+
+    def test_choose_create_new_keeps_both(self):
+        url = reverse("contacts:create")
+        response = self.client.post(
+            url,
+            {
+                "first_name": "Alex",
+                "email": "alt@example.com",
+                "phone": "(630) 111-2222",
+                "consent_email": "1",
+                "resolve_match": "create",
+                "match_id": str(self.existing.pk),
+            },
+        )
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(Contact.objects.count(), 2)
+
+    def test_choose_update_merges(self):
+        url = reverse("contacts:create")
+        response = self.client.post(
+            url,
+            {
+                "first_name": "Alexander",
+                "email": "alt@example.com",
+                "phone": "(630) 111-2222",
+                "consent_email": "1",
+                "resolve_match": "update",
+                "match_id": str(self.existing.pk),
+            },
+        )
+        self.assertEqual(response.status_code, 302)
+        self.assertEqual(Contact.objects.count(), 1)
+        self.existing.refresh_from_db()
+        self.assertEqual(self.existing.first_name, "Alexander")
+        self.assertIn("alt@example.com", self.existing.notes)