feat: Add _chunk_text_for_tts function to prioritize raw text for TTS synthesis and implement related tests

tests/test_chunk_text_for_tts_prefers_raw.py

@@ -0,0 +1,25 @@
+from abogen.web.conversion_runner import _chunk_text_for_tts
+
+
+def test_chunk_text_for_tts_prefers_text_over_normalized_text():
+    entry = {
+        # Simulate a pre-normalized chunk that lost the asterisk.
+        "normalized_text": "Unfuk",
+        # Raw chunk should preserve censored token for manual overrides.
+        "text": "Unfu*k",
+    }
+
+    assert _chunk_text_for_tts(entry) == "Unfu*k"
+
+
+def test_chunk_text_for_tts_falls_back_to_original_text_then_normalized_text():
+    entry = {
+        "original_text": "Hello * world",
+        "normalized_text": "Hello world",
+    }
+    assert _chunk_text_for_tts(entry) == "Hello * world"
+
+    entry2 = {
+        "normalized_text": "Only normalized",
+    }
+    assert _chunk_text_for_tts(entry2) == "Only normalized"