Surface tool dialogs: Patch (sketch profiles or a loop of edges), Stitch (tolerance), Thicken (thickness, one side or symmetric, operation), Extend (edges, distance), Trim (tool plane or face, side to keep) and Split Face; Split Body takes any face as its tool (a curved face's surface extended). Live previews and Edit Feature; icons for patch, stitch and thicken drawn in code

Fixes #19

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

crates/ui-egui/src/lib.rs

@@ -23,6 +23,7 @@ pub mod dialogs_move;
 pub mod dialogs_parts;
 pub mod dialogs_plastic;
 pub mod dialogs_sheet;
+pub mod dialogs_surface;
 pub mod dim_view;
 pub mod documents;
 pub mod drag_snap;