PDF underlays: attach dialog with pages, underlay tab, layers, import settings and file import, unload on the definition

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/ui/window/mod.rs

@@ -24,5 +24,6 @@ pub mod annotation_data;
 pub mod alias_editor;
 pub mod find_replace;
 pub mod named_parameters;
+pub mod pdf_dialogs;
 pub mod xref_help;
 pub mod xref_manager;