fix(controls): breadcrumb and search field at the toolkit's heights

The breadcrumb, whose segments are button plates, was a crate constant
of 24px; it now asks button_height() at the one site every page lays it
out from, so the graph pane and Space map follow a config change. The
browse page's search field was a hand-set 26px; it is textbox_height(),
like the chooser's name box.

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

 src/main.rs         |  2 +-
 src/pages/browse.rs |  7 ++++---
 src/pages/mod.rs    | 15 ++++++++++-----
 3 files changed, 15 insertions(+), 9 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index f1aa8ae..06e1e95 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -13,7 +13,7 @@ use cce_files::pages::browse::is_project_dir;
 
 // ── Layout constants ────────────────────────────────────────────────
 
-const ROW_H: f32 = 24.0;        // context-menu / breadcrumb row height
+const ROW_H: f32 = 24.0;        // context-menu row height
 const DIALOG_W: f32 = 400.0;
 const DIALOG_H: f32 = 160.0;
 const MENU_MIN_W: f32 = 120.0;
diff --git a/src/pages/browse.rs b/src/pages/browse.rs
index 8f11e79..5ccfc6a 100644
--- a/src/pages/browse.rs
+++ b/src/pages/browse.rs
@@ -229,7 +229,7 @@ pub fn view(state: &mut BrowseState, cx: f32, cy: f32, cw: f32, ch: f32, select_
     let client_h = ch - 2.0 * margin;
     layout.init(client_x, client_y, client_w, client_h);
 
-    let breadcrumb_h = crate::pages::BREADCRUMB_H;
+    let breadcrumb_h = crate::pages::breadcrumb_h();
     let textbox_h = cce_ui::layout::textbox_height();
 
     // 1. Allocate and render the Breadcrumb, where every page puts it.
@@ -335,8 +335,9 @@ pub fn view(state: &mut BrowseState, cx: f32, cy: f32, cw: f32, ch: f32, select_
 
     // Dissolved List (Phase 6z): scroll state, rows, and frame prims are app-owned.
     // When the search strip is open it reserves the bottom of the frame, exactly as
-    // the legacy List::set_rect carved its scroll frame.
-    let search_h = 26.0;
+    // the legacy List::set_rect carved its scroll frame. The search field is
+    // the toolkit's textbox height, like the chooser's name box below.
+    let search_h = textbox_h;
     // The strip stands off the well's rim (and the rows above it) by the
     // pane rung, on both axes.
     let search_pad = cce_ui::layout::plate_padding();
diff --git a/src/pages/mod.rs b/src/pages/mod.rs
index c787961..91c091e 100644
--- a/src/pages/mod.rs
+++ b/src/pages/mod.rs
@@ -38,8 +38,12 @@ impl Page {
     }
 }
 
-/// The breadcrumb's height on every page.
-pub const BREADCRUMB_H: f32 = 24.0;
+/// The breadcrumb's height on every page. Its segments are button plates, so
+/// it is one button tall: the toolkit's control height (as the widget's own
+/// `intrinsic_size` says), not a number of this crate's.
+pub fn breadcrumb_h() -> f32 {
+    cce_ui::layout::button_height()
+}
 
 /// Lay out, render and carve a page's breadcrumb: the pane's full width along
 /// its top edge, the same on every page, so switching views leaves it where it
@@ -56,10 +60,11 @@ pub fn breadcrumb_header(
     cw: f32,
     ctx: &mut cce_ui::context::UiContext,
 ) -> f32 {
-    cce_ui::layout::render_widget(pc, breadcrumb, cx, cy, cw, BREADCRUMB_H, ctx);
-    let rect = cce_ui::scene::layout::Rect { x: cx, y: cy, width: cw, height: BREADCRUMB_H };
+    let h = breadcrumb_h();
+    cce_ui::layout::render_widget(pc, breadcrumb, cx, cy, cw, h, ctx);
+    let rect = cce_ui::scene::layout::Rect { x: cx, y: cy, width: cw, height: h };
     breadcrumb_relief(pc, breadcrumb, rect);
-    cy + BREADCRUMB_H + cce_ui::layout::root_plate_gap()
+    cy + h + cce_ui::layout::root_plate_gap()
 }
 
 /// Mirror the breadcrumb's relief into a flat-path [`PageContent`]: the