afegits fixes especifics amb confirmació

processors/page_normalizer.py

@@ -12,6 +12,32 @@ def _natural_sort_key(name: str):
     return [int(p) if p.isdigit() else p.lower() for p in parts]
 
 
+def preview_normalize_pages(work_dir: str) -> list[tuple[str, str]]:
+    """Devuelve lista de (nombre_actual, nombre_final) sin modificar nada."""
+    images = []
+    for root, _, files in os.walk(work_dir):
+        for f in files:
+            ext = os.path.splitext(f)[1].lower()
+            if ext in IMAGE_EXTENSIONS:
+                images.append(os.path.join(root, f))
+
+    images.sort(key=lambda p: _natural_sort_key(os.path.splitext(os.path.basename(p))[0]))
+    total = len(images)
+    if total == 0:
+        return []
+
+    width = len(str(total))
+    result = []
+    for i, src in enumerate(images):
+        ext = os.path.splitext(src)[1].lower()
+        original_name = os.path.basename(src)
+        final_name = f"{str(i + 1).zfill(width)}{ext}"
+        if original_name != final_name:
+            result.append((original_name, final_name))
+
+    return result
+
+
 def normalize_pages(work_dir: str) -> StepResult:
     """
     Renombra las imágenes del cómic a una numeración secuencial con zero-padding.