fix: give test user a real team in test_shared_filter

The test was inserting a "Team Script" with team_id=NULL (since the
test user has no team), then expecting shared=true to return it.
SQL NULL=NULL is falsy, so the query correctly returned nothing.
Fix: create a team, assign it to the user, then test the filter.

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

backend/tests/test_script_builder.py

@@ -617,10 +617,24 @@ class TestScriptTemplateFilters:
         """shared=true returns only templates shared with the user's team."""
         user_resp = await client.get("/api/v1/auth/me", headers=auth_headers)
         user_id = user_resp.json()["id"]
-        team_id = user_resp.json().get("team_id")
 
         cat_id = "b0000000-0000-0000-0000-000000000001"
 
+        # Create a team and assign the test user to it
+        team_id = str(uuid_mod.uuid4())
+        await test_db.execute(
+            sa.text("""
+                INSERT INTO teams (id, name, created_at)
+                VALUES (:tid, 'Test Team', NOW())
+            """),
+            {"tid": team_id},
+        )
+        await test_db.execute(
+            sa.text("UPDATE users SET team_id = :tid WHERE id = :uid"),
+            {"tid": team_id, "uid": user_id},
+        )
+        await test_db.commit()
+
         # Template shared with user's team
         await test_db.execute(
             sa.text("""