Add export to latex button (i think)

generate_gallery.py

@@ -183,7 +183,7 @@ def build_gallery(source_dir: Path, web_dir: Path,
     if relative_path == Path("."):
         assets_path = "../assets"
     else:
-        # Count the number of directory levels to go back
+        # Count directory levels to go back to gallery, then to public_html
         depth = len(relative_path.parts)
         assets_path = "../" * (depth + 1) + "assets"
 
@@ -345,6 +345,10 @@ def main() -> None:
                 "total_size_bytes": current_stats["total_size"]
             }
 
+            # Calculate relative path to assets for single file
+            # Single files are at depth 1 (gallery_root/source.name/index.html)
+            assets_path = "../assets"
+            
             output_html = source_web_dir / "index.html"
             with output_html.open("w") as f:
                 f.write(template.render(
@@ -355,7 +359,7 @@ def main() -> None:
                     ui=CONFIG.ui,
                     stats=stats,
                     folder_metadata={},
-                    assets_path="../../assets"
+                    assets_path=assets_path
                 ))
 
             print(f"Generated {output_html}")