M3.17: dialog modules in rustfmt order

The swatch and gradient merges left the module list unsorted, which cargo fmt --check rejects.

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

crates/ui-egui/src/dialogs/mod.rs

@@ -15,8 +15,8 @@ mod document_setup;
 mod effect;
 mod export_for_screens;
 mod form;
-pub mod new_color_group;
 mod gradient_stop;
+pub mod new_color_group;
 mod new_document;
 pub mod new_swatch;
 mod path_ops;