Fix float-literal fallback lints for Rust 1.97

rustc 1.97 promotes the float-literal type-fallback check on generic
`impl Into<f32>` arguments (rust#154024) to a denied lint, which breaks
the editor's `#![deny(warnings)]` build: every bare literal passed to
`egui::Stroke::new` now needs an explicit type. Suffix the eleven
affected literals with `_f32`; no behavior change.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

editor/src/shell.rs

@@ -2251,7 +2251,7 @@ impl<'a> ShellTabViewer<'a> {
         stroke_rect(
             &painter,
             tab_rect.shrink(1.5),
-            egui::Stroke::new(3.0, color),
+            egui::Stroke::new(3.0_f32, color),
         );
         painter.text(
             tab_rect.left_top() + egui::vec2(8.0, 6.0),
@@ -2312,7 +2312,7 @@ impl<'a> ShellTabViewer<'a> {
                 egui::Color32::from_rgb(110, 220, 120) // green: solid
             };
             let selected = self.state.selected == Some(entity);
-            let stroke = egui::Stroke::new(if selected { 2.0 } else { 1.2 }, color);
+            let stroke = egui::Stroke::new(if selected { 2.0_f32 } else { 1.2_f32 }, color);
             for (a, b) in collider_wire_segments(&col) {
                 let (Some(pa), Some(pb)) = (
                     project(pose.transform_point(a), &overlay.view_proj, tab_rect),
@@ -2344,7 +2344,7 @@ impl<'a> ShellTabViewer<'a> {
             project(viz.origin, &overlay.view_proj, tab_rect),
             project(viz.end, &overlay.view_proj, tab_rect),
         ) {
-            painter.line_segment([a, b], egui::Stroke::new(1.5, cyan));
+            painter.line_segment([a, b], egui::Stroke::new(1.5_f32, cyan));
         }
 
         // The hit surface: a dot at the contact point + a normal whisker.
@@ -2359,7 +2359,7 @@ impl<'a> ShellTabViewer<'a> {
                 project(hit.point, &overlay.view_proj, tab_rect),
                 project(tip, &overlay.view_proj, tab_rect),
             ) {
-                painter.line_segment([a, b], egui::Stroke::new(2.0, magenta));
+                painter.line_segment([a, b], egui::Stroke::new(2.0_f32, magenta));
             }
         }
     }
@@ -2470,7 +2470,7 @@ impl<'a> ShellTabViewer<'a> {
         ) else {
             return;
         };
-        painter.line_segment([pa, pb], egui::Stroke::new(2.5, color));
+        painter.line_segment([pa, pb], egui::Stroke::new(2.5_f32, color));
         // Arrowhead at the tip — a small filled triangle perpendicular to
         // the line direction in screen space.
         let dir = (pb - pa).normalized();
@@ -2521,7 +2521,7 @@ impl<'a> ShellTabViewer<'a> {
         } else {
             egui::Color32::from_rgba_unmultiplied(255, 120, 120, if engaged { 220 } else { 130 })
         };
-        let stroke = egui::Stroke::new(1.5, color);
+        let stroke = egui::Stroke::new(1.5_f32, color);
         painter.add(egui::Shape::convex_polygon(projected, color, stroke));
     }
 
@@ -2551,7 +2551,7 @@ impl<'a> ShellTabViewer<'a> {
             return;
         }
         let color = axis_color(axis, engaged);
-        painter.add(egui::Shape::line(pts, egui::Stroke::new(2.0, color)));
+        painter.add(egui::Shape::line(pts, egui::Stroke::new(2.0_f32, color)));
     }
 
     fn hierarchy(&mut self, ui: &mut egui::Ui) {
@@ -2705,7 +2705,7 @@ impl<'a> ShellTabViewer<'a> {
                             DropZone::Child
                         };
                         let accent = ui.visuals().selection.bg_fill;
-                        let line = egui::Stroke::new(2.0, accent);
+                        let line = egui::Stroke::new(2.0_f32, accent);
                         match zone {
                             DropZone::Before => {
                                 ui.painter().line_segment(
@@ -3333,7 +3333,7 @@ impl<'a> ShellTabViewer<'a> {
                     if r.contains(pos) {
                         let above = (pos.y - r.top()) < r.height() / 2.0;
                         let accent = ui.visuals().selection.bg_fill;
-                        let line = egui::Stroke::new(2.0, accent);
+                        let line = egui::Stroke::new(2.0_f32, accent);
                         let y = if above { r.top() } else { r.bottom() };
                         ui.painter().line_segment(
                             [egui::pos2(r.left(), y), egui::pos2(r.right(), y)],
@@ -5165,7 +5165,7 @@ fn draw_ui_preview(ui: &mut egui::Ui, panel: &UiPanel) {
     stroke_rect(
         &painter,
         egui::Rect::from_min_size(origin, draw),
-        egui::Stroke::new(1.0, egui::Color32::DARK_GRAY),
+        egui::Stroke::new(1.0_f32, egui::Color32::DARK_GRAY),
     );
 
     let theme = UiTheme::new();