collapse dev tools into disclosure in admin sidebar

LiveDashboard, Errors, and Jobs are now behind a "Developer tools"
toggle, keeping View shop and Log out as the prominent footer links.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

assets/css/admin/components.css

@@ -3286,6 +3286,35 @@
   border-top: 1px solid var(--t-border-default);
 }
 
+/* Dev tools disclosure in sidebar footer */
+.admin-dev-tools {
+  & > summary {
+    display: flex;
+    align-items: center;
+    gap: 0.5rem;
+    padding: 0.375rem 0.75rem;
+    font-size: 0.875rem;
+    color: var(--t-text-secondary);
+    cursor: pointer;
+    list-style: none;
+
+    &::marker, &::-webkit-details-marker { display: none; }
+  }
+
+  & > summary:hover { color: var(--t-text-primary); }
+
+  & .admin-dev-tools-chevron {
+    margin-left: auto;
+    transition: transform 0.15s ease;
+  }
+
+  &[open] .admin-dev-tools-chevron { transform: rotate(90deg); }
+
+  & > .admin-nav {
+    padding-left: 1rem;
+  }
+}
+
 /* Sidebar nav area */
 .admin-sidebar-nav {
   flex: 1;