feat(migration): Add hidden field to Activity model

Introduces a boolean field 'hidden' to the Activity model to
allow activities to be marked as hidden. This can be utilized
for filtering visible activities without deleting them from
the database.

mood/migrations/0002_activity_hidden.py

@@ -0,0 +1,18 @@
+# Generated by Django 5.0.6 on 2024-11-18 05:35
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("mood", "0001_initial"),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name="activity",
+            name="hidden",
+            field=models.BooleanField(default=False),
+        ),
+    ]