afegits fixes especifics amb confirmació

processors/image_normalizer.py

@@ -6,6 +6,27 @@ from core.constants import IMAGE_EXTENSIONS
 from core.result import StepResult
 
 
+def preview_normalize_images(work_dir: str, target_ext: str) -> list[tuple[str, str]]:
+    """Devuelve lista de (nombre_actual, nombre_final) sin convertir nada."""
+    target_ext = target_ext.lower()
+    if not target_ext.startswith("."):
+        target_ext = "." + target_ext
+
+    result = []
+    for root, _, files in os.walk(work_dir):
+        for f in files:
+            ext = os.path.splitext(f)[1].lower()
+            normalized_ext = ".jpg" if ext == ".jpeg" else ext
+            if ext not in IMAGE_EXTENSIONS:
+                continue
+            if normalized_ext == target_ext:
+                continue
+            stem = os.path.splitext(f)[0]
+            result.append((f, stem + target_ext))
+
+    return result
+
+
 def normalize_images(work_dir: str, target_ext: str = ".jpg") -> StepResult:
     """
     Convierte todas las imágenes al formato indicado por target_ext.