fix: stabilize console topbar layout

src/web/index.css

@@ -13381,9 +13381,86 @@ textarea:focus {
   overflow-wrap: anywhere;
 }
 
+/* Final topbar layout guard: keep brand, nav, and user actions in their own lanes. */
+.topbar {
+  display: grid;
+  grid-template-columns: minmax(230px, 280px) minmax(320px, max-content) minmax(300px, 1fr);
+  column-gap: 18px;
+  align-items: center;
+  overflow: visible;
+  border-radius: 0;
+}
+
+.topbar-logo {
+  min-width: 0;
+  max-width: 280px;
+  margin-right: 0;
+  padding-right: 18px;
+  border-right: 1px solid var(--console-line);
+}
+
+.topbar-nav {
+  width: auto;
+  max-width: none;
+  justify-self: center;
+  display: inline-flex;
+  flex: 0 0 auto;
+  overflow: visible;
+  white-space: nowrap;
+}
+
+.topbar-nav a,
+.topbar-nav-item {
+  flex: 0 0 auto;
+}
+
+.topbar-right {
+  min-width: 0;
+  display: flex;
+  justify-content: flex-end;
+  overflow: visible;
+}
+
+.topbar-right > * {
+  flex: 0 0 auto;
+}
+
+.topbar-user-trigger {
+  min-width: 154px;
+  max-width: 196px;
+}
+
+@media (max-width: 1260px) {
+  .topbar {
+    grid-template-columns: minmax(170px, 220px) minmax(280px, max-content) minmax(220px, 1fr);
+    column-gap: 12px;
+  }
+
+  .topbar-logo {
+    max-width: 220px;
+    padding-right: 12px;
+  }
+
+  .topbar-logo-subtitle {
+    display: none;
+  }
+
+  .topbar-search-trigger {
+    min-width: 42px;
+    width: 42px;
+    padding-inline: 0;
+    justify-content: center;
+  }
+
+  .topbar-search-trigger .topbar-search-label,
+  .topbar-search-trigger .topbar-search-kbd {
+    display: none;
+  }
+}
+
 @media (max-width: 1180px) {
   .topbar {
-    grid-template-columns: minmax(126px, auto) minmax(230px, 360px) minmax(248px, 1fr);
+    grid-template-columns: minmax(150px, 190px) minmax(240px, max-content) minmax(150px, 1fr);
     gap: 10px;
     padding-inline: 16px;
   }
@@ -13399,8 +13476,8 @@ textarea:focus {
   }
 
   .topbar-nav {
-    width: min(360px, 100%);
-    max-width: 360px;
+    width: auto;
+    max-width: none;
   }
 
   .topbar-nav a,