V9.1 fix export: SVG sanitize before export, full diagnostics, backup PPTX fallback

interface/app_gradio.py

@@ -736,12 +736,37 @@ def _write_fallback_svg(svg_dir, name, slide, colors, font_title, font_body, num
 # STEP 4: POST-PROCESSING & EXPORT
 # ============================================================
 
+
+def sanitize_svgs_for_export(project_path):
+    """Final safety pass before svg_to_pptx.
+    Removes/normalizes SVG constructs that sometimes pass the checker but break the converter.
+    """
+    svg_dir = Path(project_path) / "svg_output"
+    for svg_file in svg_dir.glob("*.svg"):
+        txt = svg_file.read_text(encoding="utf-8", errors="ignore")
+        # Remove SVG filters if converter chokes on them; visual loss is minor vs export failure
+        txt = re.sub(r'<filter[\s\S]*?</filter>', '', txt)
+        txt = re.sub(r'\sfilter="url\([^\"]+\)"', '', txt)
+        # Replace auto dimensions in images (invalid for DrawingML conversion)
+        txt = re.sub(r'height="auto"', 'height="400"', txt)
+        txt = re.sub(r'width="auto"', 'width="400"', txt)
+        # Remove CSS-ish attributes that are not essential and can upset conversion
+        txt = re.sub(r'\sletter-spacing="[^"]*"', '', txt)
+        # Remove comments
+        txt = re.sub(r'<!--[\s\S]*?-->', '', txt)
+        # Ensure XML ampersands are escaped when not entities
+        txt = re.sub(r'&(?!amp;|lt;|gt;|quot;|apos;|#\d+;|#x[0-9A-Fa-f]+;)', '&amp;', txt)
+        svg_file.write_text(txt, encoding="utf-8")
+
 def postprocess_and_export(project_path):
     """Run quality check + finalize_svg + svg_to_pptx."""
     env = os.environ.copy()
 
     outputs = []
 
+    sanitize_svgs_for_export(project_path)
+    outputs.append("[SANITIZE] SVG safety pass completed before export\n")
+
     # final quality check before finalize (original PPT Master gate)
     qc = subprocess.run([sys.executable, str(SCRIPTS_DIR / "svg_quality_checker.py"), project_path],
         capture_output=True, text=True, timeout=120, cwd=str(SCRIPTS_DIR), env=env)
@@ -836,7 +861,7 @@ def step2_handler(data_json, style, image_mode, verify_vision=True, progress=gr.
     progress(0.85, desc="Export PPTX...")
     log.append("━━━ PHASE 3: Post-traitement & Export ━━━")
     pp_out = postprocess_and_export(project_path)
-    log.append(f"  {pp_out[:400]}")
+    log.append(pp_out[-6000:])
 
     # Find PPTX
     pptx_files = glob.glob(f"{project_path}/exports/*.pptx")