Synchronize chapter and navigation translations with Chinese prose indentation

main.py

@@ -12,6 +12,7 @@ from src.common.config import load_global_config
 from src.preprocessing.epub_cleaner import EpubCleaner
 from src.preprocessing.profiler import BookProfiler
 from src.preprocessing.text_extractor import FineGrainedExtractor
+from src.preprocessing.navigation import prepare_navigation
 from src.translation.manifest_manager import ManifestManager
 from src.translation.translator_engine import Translator
 from src.translation.glossary import prepare_glossary
@@ -65,7 +66,8 @@ async def run_pipeline(args):
         if work["structure"].exists() and not args.force_clean:
             logger.info(f"Reusing existing book_structure: {work['structure']}")
             structure = BookStructure.load(work["structure"])
-            if structure.source_sha256 != hashlib.sha256(input_path.read_bytes()).hexdigest():
+            if (structure.preprocessing_version < 3 or
+                structure.source_sha256 != hashlib.sha256(input_path.read_bytes()).hexdigest()):
                 logger.info("Source changed or old preprocessing cache; re-cleaning")
                 structure = BookStructure.load(EpubCleaner(input_path, work["root"]).clean())
         else:
@@ -77,6 +79,8 @@ async def run_pipeline(args):
         # 2. Extraction
         extractor = FineGrainedExtractor()
         manifest_entries = extractor.extract(structure)
+        prepare_navigation(input_path,structure,manifest_entries)
+        structure.save(work["structure"])
         
         # 3. Manifest Management
         manifest_manager = ManifestManager(work["manifest"])