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

code/tests/test_random_seed_persistence.py

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+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_recent_seeds_flow(client: TestClient):
+    # Initially empty
+    r0 = client.get("/api/random/seeds")
+    assert r0.status_code == 200, r0.text
+    data0 = r0.json()
+    assert data0.get("seeds") == [] or data0.get("seeds") is not None
+
+    # Run a full build with a specific seed
+    r1 = client.post("/api/random_full_build", json={"seed": 1001})
+    assert r1.status_code == 200, r1.text
+    d1 = r1.json()
+    assert d1.get("seed") == 1001
+
+    # Reroll (should increment to 1002) and be stored
+    r2 = client.post("/api/random_reroll", json={"seed": 1001})
+    assert r2.status_code == 200, r2.text
+    d2 = r2.json()
+    assert d2.get("seed") == 1002
+
+    # Fetch recent seeds; expect to include both 1001 and 1002, with last==1002
+    r3 = client.get("/api/random/seeds")
+    assert r3.status_code == 200, r3.text
+    d3 = r3.json()
+    seeds = d3.get("seeds") or []
+    assert 1001 in seeds and 1002 in seeds
+    assert d3.get("last") == 1002