Add batch duplicate review workflow

tests/test_web.py

@@ -9,6 +9,7 @@ from serato_doctor.web import (
     _verified_audio,
     analyze_paths,
     duplicate_repair,
+    duplicate_repair_batch,
 )
 
 
@@ -113,3 +114,29 @@ def test_duplicate_details_include_preview_and_finder_controls(tmp_path):
     assert len(group["file_previews"]) == 2
     assert group["file_previews"][0]["audio_url"].startswith("/api/audio?")
     assert group["file_previews"][0]["reveal_token"]
+
+
+def test_batch_preview_combines_approved_groups_without_changes(tmp_path):
+    serato = tmp_path / "_Serato_"
+    serato.mkdir()
+    music = tmp_path / "Music"
+    choices = []
+    for filename in ("First.mp3", "Second.mp3"):
+        keeper = music / "A" / filename
+        duplicate = music / "B" / filename
+        keeper.parent.mkdir(parents=True, exist_ok=True)
+        duplicate.parent.mkdir(parents=True, exist_ok=True)
+        keeper.write_bytes(b"keeper")
+        duplicate.write_bytes(b"duplicate")
+        choices.append(
+            {"keeper": str(keeper), "group_files": [str(keeper), str(duplicate)]}
+        )
+
+    result = duplicate_repair_batch(
+        serato, music, choices, backup_limit=10
+    )
+
+    assert result["applied"] is False
+    assert result["choice_count"] == 2
+    assert len(result["replaced"]) == 2
+    assert all(not Path(choice["group_files"][1]).is_symlink() for choice in choices)