Sidebar customizer: drop the Search row, skip More for a lone item

- Search is reached from the top bar, so it is no longer previewed as a fixed
  sidebar nav row; New chat stays.
- More now appears only when it would hold two or more rows. A single unpinned
  row renders inline in its saved order position instead: a flyout wrapping one
  item costs a click and earns nothing. The customizer's More preview follows the
  same threshold.

studio/frontend/src/components/app-sidebar.tsx

@@ -825,12 +825,16 @@ export function AppSidebar() {
       },
     },
   };
-  const pinnedNavIds = sidebarNav
-    .filter((item) => item.pinned)
-    .map((item) => item.id);
-  const overflowNavIds = sidebarNav
+  const unpinnedNavIds = sidebarNav
     .filter((item) => !item.pinned)
     .map((item) => item.id);
+  // A flyout wrapping a single row costs a click and earns nothing, so More only
+  // appears once it would hold two or more; a lone unpinned row renders inline,
+  // in its saved order position.
+  const overflowNavIds = unpinnedNavIds.length > 1 ? unpinnedNavIds : [];
+  const inlineNavIds = sidebarNav
+    .filter((item) => item.pinned || overflowNavIds.length === 0)
+    .map((item) => item.id);
 
   const showSidebarBrand = !usesCustomTitlebar;
   const showCompactMacBrand = showSidebarBrand && usesNativeMacTitlebar;
@@ -1612,7 +1616,7 @@ export function AppSidebar() {
               {/* Rows come from the saved pin order (Settings -> Appearance ->
                   Sidebar navigation). Pinned ids render here in order; the rest
                   fall into the More flyout below, so nothing is unreachable. */}
-              {pinnedNavIds.map((id) => {
+              {inlineNavIds.map((id) => {
                 const row = navRows[id];
                 return (
                   <NavItem

studio/frontend/src/features/settings/components/sidebar-nav-customizer.tsx

@@ -11,7 +11,6 @@ import {
   Folder01Icon,
   Image03Icon,
   MoreHorizontalIcon,
-  Search01Icon,
 } from "@hugeicons/core-free-icons";
 import { HugeiconsIcon } from "@hugeicons/react";
 import { Reorder, useDragControls } from "motion/react";
@@ -109,9 +108,10 @@ function MovableRow({ item }: { item: SidebarNavItemPref }) {
 
 /**
  * Pin and reorder the sidebar navigation rows. A row with its switch off moves
- * into the "More" flyout instead of disappearing, so every page stays reachable.
- * New Chat and Search render as static rows: they are actions pinned to the top,
- * not destinations.
+ * into the "More" flyout instead of disappearing, so every page stays reachable
+ * -- unless it is the only unpinned row, which stays inline (a menu holding one
+ * item earns nothing). New chat renders as a static row: it is an action pinned
+ * to the top, not a destination.
  */
 export function SidebarNavCustomizer() {
   const t = useT();
@@ -121,7 +121,6 @@ export function SidebarNavCustomizer() {
   return (
     <div className="flex flex-col rounded-xl border border-border/70 p-1.5">
       <FixedRow icon={Edit03Icon} label={t("shell.navigation.newChat")} />
-      <FixedRow icon={Search01Icon} label={t("shell.navigation.search")} />
       <Reorder.Group
         axis="y"
         values={sidebarNav.map((item) => item.id)}
@@ -138,9 +137,10 @@ export function SidebarNavCustomizer() {
           <MovableRow key={item.id} item={item} />
         ))}
       </Reorder.Group>
-      {/* Only meaningful once something is unpinned -- with everything pinned the
-          sidebar has no More row at all. */}
-      {unpinnedCount > 0 && (
+      {/* Only meaningful at two or more: with everything pinned there is no More
+          row, and a lone unpinned row renders inline rather than hiding behind
+          a menu built for one item. */}
+      {unpinnedCount > 1 && (
         <>
           <div className="mx-2 my-1 border-t border-border/70" />
           <FixedRow

studio/frontend/src/features/settings/stores/appearance-custom-store.ts

@@ -84,10 +84,10 @@ export const SIDEBAR_MENU_DEFAULT_VISIBLE: Record<SidebarMenuItemId, boolean> =
 
 /**
  * Sidebar NAVIGATION rows the user can pin and reorder (distinct from the
- * profile-menu entries above). New Chat and Search stay fixed at the top: they
- * are actions, not destinations. Array order is render order; an unpinned row
- * moves into the "More" flyout rather than disappearing, so no page becomes
- * unreachable.
+ * profile-menu entries above). New chat stays fixed at the top: it is an action,
+ * not a destination. Array order is render order; an unpinned row moves into the
+ * "More" flyout rather than disappearing, so no page becomes unreachable --
+ * except when it is the only unpinned row, which renders inline instead.
  */
 export const SIDEBAR_NAV_ITEM_IDS = [
   "projects",

studio/frontend/src/i18n/locales/en.ts

@@ -519,7 +519,7 @@ export const en = {
       sidebarNav: {
         title: "Sidebar navigation",
         description:
-          "Pin and reorder the sidebar tabs. Anything unpinned moves into the More menu instead of being hidden. New chat and Search stay fixed.",
+          "Pin and reorder the sidebar tabs. Anything unpinned moves into the More menu instead of being hidden, unless it is the only one left. New chat stays fixed.",
         dragToReorder: "Drag to reorder",
         pinToSidebar: "Pin {name} to the sidebar",
         moreHolds: "More ({count})",

studio/frontend/src/i18n/locales/zh-CN.ts

@@ -373,7 +373,7 @@ export const zhCN = {
       sidebarNav: {
         title: "侧边栏导航",
         description:
-          "固定并重新排序侧边栏标签。取消固定的项目会移入“更多”菜单而不是被隐藏。新聊天和搜索保持固定。",
+          "固定并重新排序侧边栏标签。取消固定的项目会移入“更多”菜单而不是被隐藏；若仅剩一项，则直接显示。新聊天保持固定。",
         dragToReorder: "拖动以重新排序",
         pinToSidebar: "将{name}固定到侧边栏",
         moreHolds: "更多（{count}）",