fix(translators): ameliorer le respect des formats de fichiers pour Excel, PowerPoint et PDF

- Excel: elargissement intelligent des colonnes pour le texte etendu et alignement RTL des cellules

- PowerPoint: retour a la ligne et auto-fit anti-debordement, colonnes de tableaux en RTL

- PDF: protection multi-colonnes pour eviter les chevauchements et formatage hebreu

- Tests: validation de non-regression pour tous les formats

translators/pptx_translator.py

@@ -151,6 +151,14 @@ def _apply_ltr_to_shape(shape) -> None:
             _unset_pptx_paragraph_rtl(paragraph)
 
     if shape.shape_type == MSO_SHAPE_TYPE.TABLE:
+        try:
+            tbl_el = shape._element.find(f".//{{{_NS_A}}}tbl")
+            if tbl_el is not None:
+                tblPr = tbl_el.find(f"{{{_NS_A}}}tblPr")
+                if tblPr is not None and "rtl" in tblPr.attrib:
+                    del tblPr.attrib["rtl"]
+        except Exception:
+            pass
         for row in shape.table.rows:
             for cell in row.cells:
                 for paragraph in cell.text_frame.paragraphs:
@@ -168,6 +176,14 @@ def _apply_rtl_to_shape(shape) -> None:
             _set_pptx_paragraph_rtl(paragraph)
 
     if shape.shape_type == MSO_SHAPE_TYPE.TABLE:
+        try:
+            tbl_el = shape._element.find(f".//{{{_NS_A}}}tbl")
+            if tbl_el is not None:
+                tblPr = tbl_el.find(f"{{{_NS_A}}}tblPr")
+                if tblPr is not None:
+                    tblPr.set("rtl", "1")
+        except Exception:
+            pass
         for row in shape.table.rows:
             for cell in row.cells:
                 for paragraph in cell.text_frame.paragraphs:
@@ -978,6 +994,19 @@ class PowerPointTranslator:
         if not text_frame.text.strip():
             return
 
+        # Ensure word wrap is enabled so expanding translated text wraps naturally
+        # inside the shape rather than stretching past the slide edge.
+        # If no autofit is explicitly configured, enable text-to-fit-shape
+        # so PowerPoint can scale font size down if the translated text is too long.
+        try:
+            if not getattr(text_frame, "word_wrap", None):
+                text_frame.word_wrap = True
+            from pptx.enum.text import MSO_AUTO_SIZE
+            if getattr(text_frame, "auto_size", None) is None:
+                text_frame.auto_size = MSO_AUTO_SIZE.TEXT_TO_FIT_SHAPE
+        except Exception:
+            pass
+
         tag_r = f"{{{_NS_A}}}r"
         tag_t = f"{{{_NS_A}}}t"