High-res: bestiary shows the detailed sprites, toolbar buttons on stone

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

src/ui.rs

@@ -912,7 +912,14 @@ impl Ui {
         // locked tools (campaign: not yet available) are drawn dark
         let tool_button = |bx: f32, by: f32, bw: f32, icon_id: u32, key: &str, label: &str, sel: bool, hovered: bool, locked: bool| {
             let r = Rect::new(bx + px, by, bw - 2.0 * px, 3.0 * CH());
-            draw_rectangle(r.x, r.y, r.w, r.h, if sel { Color::new(0.42, 0.26, 0.1, 1.0) } else if hovered { Color::new(0.18, 0.13, 0.1, 1.0) } else { Color::new(0.1, 0.07, 0.07, 1.0) });
+            let fill = if sel { Color::new(0.42, 0.26, 0.1, 1.0) } else if hovered { Color::new(0.18, 0.13, 0.1, 1.0) } else { Color::new(0.1, 0.07, 0.07, 1.0) };
+            if crate::gfx::high_res_ui() {
+                // high-res: a slab of stone in the button's colour (the material is light grey)
+                let k = 1.6;
+                draw_texture_ex(&gfx.materials[1], r.x, r.y, Color::new(fill.r * k, fill.g * k, fill.b * k, 1.0), DrawTextureParams { dest_size: Some(vec2(r.w, r.h)), ..Default::default() });
+            } else {
+                draw_rectangle(r.x, r.y, r.w, r.h, fill);
+            }
             // the active tool: pulsing frame
             let frame = if sel { if pulse { WHITE } else { FRAME_HI } } else { Color::new(0.35, 0.28, 0.2, 1.0) };
             draw_rectangle_lines(r.x, r.y, r.w, r.h, if sel { 3.0 * px } else { 2.0 * px }, frame);