fix(controls): menubar dropdowns and vault band at the toolkit's heights

The classic menubar's File/Edit/View dropdowns sat at a hand-set y=8
that only centred a 26px control, with a 26px fallback; the vault band's
chips were a literal 24 and its filter box 28. They now ask cce-ui
(dropdown_height, button_height, textbox_height), each centred in its bar.

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

 src/main.rs  | 17 ++++++++++-------
 src/vault.rs | 15 +++++++++------
 2 files changed, 19 insertions(+), 13 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 82b9bdc..0c5260e 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -895,9 +895,11 @@ impl Application for GraphApp {
         
 
         app.menu_bar.set_rect(0.0, 0.0, 1024.0, 42.0);
-        app.dropdown_file.set_rect(10.0, 8.0, 70.0, 26.0);
-        app.dropdown_edit.set_rect(90.0, 8.0, 70.0, 26.0);
-        app.dropdown_view.set_rect(170.0, 8.0, 70.0, 26.0);
+        let dd_h = cce_ui::layout::dropdown_height();
+        let dd_y = (42.0 - dd_h) / 2.0;
+        app.dropdown_file.set_rect(10.0, dd_y, 70.0, dd_h);
+        app.dropdown_edit.set_rect(90.0, dd_y, 70.0, dd_h);
+        app.dropdown_view.set_rect(170.0, dd_y, 70.0, dd_h);
         app.graph.set_rect(0.0, 42.0, 1024.0, 768.0 - 42.0);
 
         let args: Vec<String> = std::env::args().collect();
@@ -1191,8 +1193,9 @@ impl Application for GraphApp {
             self.menu_bar.set_rect(0.0, 0.0, size.width, 42.0);
             
             // The File/Edit/View dropdown row, laid out directly (the transparent layout
-            // Plate is DISSOLVED): a row at x=10/y=8 with 10px gaps, each dropdown sized
-            // to its label via measure (the same intrinsic sizes the scene solver used).
+            // Plate is DISSOLVED): a row from x=10 with 10px gaps, centred in the 42px
+            // bar, each dropdown sized to its label via measure (the same intrinsic
+            // sizes the scene solver used).
             {
                 let mut x = 10.0;
                 let self_ptr = self as *mut Self;
@@ -1203,8 +1206,8 @@ impl Application for GraphApp {
                     // Same sizing rule the retired scene bridge used: the dropdown's intrinsic
                     // size (widest option x configured dropdown height).
                     let sz = dd.intrinsic_size()
-                        .unwrap_or(cce_ui::scene::layout::Size::new(70.0, 26.0));
-                    dd.set_rect(x, 8.0, sz.width, sz.height);
+                        .unwrap_or(cce_ui::scene::layout::Size::new(70.0, cce_ui::layout::dropdown_height()));
+                    dd.set_rect(x, (42.0 - sz.height) / 2.0, sz.width, sz.height);
                     x += sz.width + 10.0;
                 }
             }
diff --git a/src/vault.rs b/src/vault.rs
index d8ea816..eadc220 100644
--- a/src/vault.rs
+++ b/src/vault.rs
@@ -31,7 +31,6 @@ use crate::linkgraph::{Filter, LinkGraph};
 
 const BAND_H: f32 = 40.0;
 const STATUS_H: f32 = 26.0;
-const CHIP_H: f32 = 24.0;
 const FILTER_W: f32 = 240.0;
 const LABEL_SIZE: f32 = 11.0;
 const MIN_ZOOM: f32 = 0.05;
@@ -209,12 +208,16 @@ impl VaultApp {
     fn metrics(&self) -> Metrics {
         let (w, h) = (self.width as f32, self.height as f32);
         let inset = cce_ui::layout::root_plate_inset();
-        let y = (BAND_H - CHIP_H) / 2.0;
+        // The chips and filter box at the toolkit's control heights, each
+        // centred in the band.
+        let chip_h = cce_ui::layout::button_height();
+        let filter_h = cce_ui::layout::textbox_height();
+        let y = (BAND_H - chip_h) / 2.0;
         let filter_w = FILTER_W.min(w * 0.35);
-        let filter = Rect { x: w - inset - filter_w, y: y - 2.0, width: filter_w, height: CHIP_H + 4.0 };
-        let depth_chip = Rect { x: filter.x - 12.0 - 76.0, y, width: 76.0, height: CHIP_H };
-        let local_chip = Rect { x: depth_chip.x - 8.0 - 64.0, y, width: 64.0, height: CHIP_H };
-        let global_chip = Rect { x: local_chip.x - 64.0, y, width: 64.0, height: CHIP_H };
+        let filter = Rect { x: w - inset - filter_w, y: (BAND_H - filter_h) / 2.0, width: filter_w, height: filter_h };
+        let depth_chip = Rect { x: filter.x - 12.0 - 76.0, y, width: 76.0, height: chip_h };
+        let local_chip = Rect { x: depth_chip.x - 8.0 - 64.0, y, width: 64.0, height: chip_h };
+        let global_chip = Rect { x: local_chip.x - 64.0, y, width: 64.0, height: chip_h };
         Metrics {
             area: Rect { x: 0.0, y: BAND_H, width: w, height: (h - BAND_H - STATUS_H).max(0.0) },
             global_chip,