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

code/tests/test_random_reroll_locked_commander.py

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+import json
+import os
+from fastapi.testclient import TestClient
+
+
+def _new_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
+    return TestClient(app)
+
+
+def test_reroll_keeps_commander():
+    client = _new_client()
+    # Initial random build (api path) to get commander + seed
+    r1 = client.post('/api/random_reroll', json={})
+    assert r1.status_code == 200
+    data1 = r1.json()
+    commander = data1['commander']
+    seed = data1['seed']
+
+    # First reroll with commander lock
+    headers = {'Content-Type': 'application/json'}
+    body = json.dumps({'seed': seed, 'commander': commander, 'mode': 'reroll_same_commander'})
+    r2 = client.post('/hx/random_reroll', data=body, headers=headers)
+    assert r2.status_code == 200
+    html1 = r2.text
+    assert commander in html1
+
+    # Second reroll should keep same commander (seed increments so prior +1 used on server)
+    body2 = json.dumps({'seed': seed + 1, 'commander': commander, 'mode': 'reroll_same_commander'})
+    r3 = client.post('/hx/random_reroll', data=body2, headers=headers)
+    assert r3.status_code == 200
+    html2 = r3.text
+    assert commander in html2