feat: beveled window plate + recessed status bar (the data-editor glass-slab look)

display_list opens with pc.plate() (rolled, lit perimeter at the app's
plate color) and carves the status bar's top edge in with
pc.recess_edges(), replacing the flat plate quad and the bar's opaque
background strip — the plate now shows through the bar as a step.

Co-Authored-By: Claude Fable 5 <[email protected]>

 src/main.rs     | 20 ++++++++++++++++++++
 src/renderer.rs | 15 +++++----------
 2 files changed, 25 insertions(+), 10 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 3e82827..0b41210 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -252,6 +252,26 @@ impl cce_ui::engine::Application for SystemInterface {
         }
         use cce_ui::scene::layout::Rect;
         let mut pc = cce_ui::scene::paint::PaintCtx::new();
+
+        // One glass slab (data-editor's idiom): the beveled window plate, with the
+        // status bar carved into it as a step — everything else paints on top.
+        {
+            let mut plate = cce_ui::color::to_linear([0x0a as f32 / 255.0, 0x1a as f32 / 255.0, 0x0e as f32 / 255.0, 1.0]);
+            if plate[3] > 0.001 {
+                plate[3] = cce_ui::color::active_backplate_opacity();
+            }
+            let r = 12.0f32;
+            pc.plate(Rect { x: 0.0, y: 0.0, width, height }, (r, r, r, r), plate, cce_ui::layout::bevel_width());
+            let sb_h = self.status_height;
+            let depth = cce_ui::layout::bar_wall_width().min(sb_h * 0.6);
+            pc.recess_edges(
+                Rect { x: 0.0, y: height - sb_h, width, height: sb_h },
+                (0.0, 0.0, 0.0, 0.0),
+                depth,
+                (true, false, false, false),
+            );
+        }
+
         for w in &self.widgets {
             let color = if w.hovering { w.hover_color } else { w.color };
             let rect = Rect { x: w.x, y: w.y, width: w.w, height: w.h };
diff --git a/src/renderer.rs b/src/renderer.rs
index a59463a..e9cbca0 100644
--- a/src/renderer.rs
+++ b/src/renderer.rs
@@ -183,23 +183,18 @@ impl SystemInterface {
 
             collect_window_child(&self.page_scroll_bar, &self.ui_context, logical_sw, logical_sh, plate_radius, &mut plain, &mut rounded, &mut wtexts);
 
-            // The dissolved status bar's slot in the child order.
-            let sb_y = logical_sh - self.status_height;
-            let sb_theme = cce_ui::colors::backplate_statusbar_color();
-            let sb_bg = if sb_theme[3] > 0.001 { sb_theme } else { cce_ui::color::STATUS_BG };
-            rounded.push((sb_bg, 0.0, sb_y, logical_sw, self.status_height, plate_radius, (false, false, true, true)));
+            // The status bar has no background of its own anymore: the beveled window
+            // plate shows through and display_list carves its recess (data-editor's
+            // with_recess idiom).
 
             collect_window_child(&self.page_dropdown, &self.ui_context, logical_sw, logical_sh, plate_radius, &mut plain, &mut rounded, &mut wtexts);
             if self.search_open {
                 collect_window_child(&self.search_box, &self.ui_context, logical_sw, logical_sh, plate_radius, &mut plain, &mut rounded, &mut wtexts);
             }
 
+            // The window plate itself is emitted by display_list as a beveled
+            // pc.plate() prim, under everything collected here.
             window_pc.rects.extend(plain);
-            let mut plate = cce_ui::color::to_linear([0x0a as f32 / 255.0, 0x1a as f32 / 255.0, 0x0e as f32 / 255.0, 1.0]);
-            if plate[3] > 0.001 {
-                plate[3] = cce_ui::color::active_backplate_opacity();
-            }
-            window_pc.rects.push((plate, 0.0, 0.0, logical_sw, logical_sh, plate_radius, (true, true, true, true)));
             window_pc.rects.extend(rounded);
             window_pc.texts.extend(wtexts);
         }