fix(ui): make modal layouts intrinsic

Pin Iced 0.15 so dialogs can measure content before distributing the resolved frame across child panels. Keep the web plugin notice compact and non-resizable.\n\nCloses #582

src/ui/statusbar/status_menu.rs

@@ -52,7 +52,7 @@ pub fn menu_bar<'a>(
         .close_on_background_click_global(true)
         .draw_path(DrawPath::Backdrop)
         .style(|theme: &Theme, _| {
-            let palette = theme.extended_palette();
+            let palette = theme.palette();
             iced_aw::style::menu_bar::Style {
                 bar_background: Background::Color(Color::TRANSPARENT),
                 bar_border: Border::default(),