feat(random): multi-theme groundwork, locked reroll export parity, duplicate export fix, expanded diagnostics and test coverage

code/tests/test_random_ui_page.py

@@ -0,0 +1,22 @@
+import os
+
+import pytest
+from fastapi.testclient import TestClient
+
+
+@pytest.fixture(scope="module")
+def client():
+    os.environ["RANDOM_MODES"] = "1"
+    os.environ["RANDOM_UI"] = "1"
+    os.environ["CSV_FILES_DIR"] = os.path.join("csv_files", "testdata")
+
+    from web.app import app
+
+    with TestClient(app) as c:
+        yield c
+
+
+def test_random_modes_page_renders(client: TestClient):
+    r = client.get("/random")
+    assert r.status_code == 200
+    assert "Random Modes" in r.text