Contain circuit editor scrolling

src/app/globals.css

@@ -44,12 +44,19 @@ body {
   display: flex;
   flex-direction: column;
   gap: 0.75rem;
+  min-width: 0;
 }
 
 .editor-toolbar {
   display: flex;
+  flex-wrap: wrap;
   gap: 0.5rem;
-  position: relative;
+  position: sticky;
+  top: 0;
+  z-index: 12;
+  padding: 0.35rem 0;
+  background: #fff;
+  box-shadow: 0 1px 0 rgba(196, 205, 220, 0.8);
 }
 
 .editor-toolbar button {
@@ -137,13 +144,20 @@ body {
   overflow: auto;
   border: 1px solid #d9dee8;
   background: #fff;
+  width: 100%;
+  max-width: 100%;
+  min-width: 0;
+  max-height: max(28rem, calc(100vh - 12rem));
+  scrollbar-gutter: stable;
 }
 
 .tree-editor-layout {
   display: grid;
-  grid-template-columns: 320px 1fr;
+  grid-template-columns: minmax(240px, 320px) minmax(0, 1fr);
   gap: 0.75rem;
   min-height: 560px;
+  min-width: 0;
+  align-items: start;
 }
 
 .project-device-sidebar {