Fix tile outlines drawn over units (miniquad only depth-tests with depth writes); Soul Core starts with a treasury ring

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

src/render3d.rs

@@ -262,7 +262,9 @@ void main() {
         MaterialParams {
             pipeline_params: PipelineParams {
                 depth_test: Comparison::LessOrEqual,
-                depth_write: false,
+                // miniquad only enables the depth *test* together with depth writes, so this
+                // material writes depth too; large translucent glows are therefore drawn last
+                depth_write: true,
                 color_blend: Some(BlendState::new(Equation::Add, BlendFactor::Value(BlendValue::SourceAlpha), BlendFactor::OneMinusValue(BlendValue::SourceAlpha))),
                 ..Default::default()
             },
@@ -906,15 +908,16 @@ impl R3d {
             draw_sphere(vec3(x, 0.8, z), 0.05 * fl, None, Color::new(1.0, 0.95, 0.6, 1.0));
         }
         draw_shadows(g);
-        draw_landmarks_glow(g, t);
-        draw_towers_glow(g, t);
         if let Some(f) = g.flag {
             draw_flag(f, t);
         }
+        draw_overlay(&g.map, ov, self.wall_sub);
+        // translucent glows and effects last (they write depth, see glow_material)
+        draw_landmarks_glow(g, t);
+        draw_towers_glow(g, t);
         for f in &g.fx {
             draw_fx(f, t);
         }
-        draw_overlay(&g.map, ov, self.wall_sub);
         gl_use_default_material();
         set_default_camera();