fix: 修正 logo 中 N 和 G 字母造型

N 添加对角线笔画（█▄ █），G 添加内横杠（█ ▀█），
避免与 O 字母造型雷同。同步更新 ui.ts 中的硬编码 wordmark。

packages/storybook/.storybook/mocks/app/context/layout.ts

@@ -0,0 +1,41 @@
+import { createSignal } from "solid-js"
+
+const [all, setAll] = createSignal<string[]>([])
+const [active, setActive] = createSignal<string | undefined>(undefined)
+const [reviewOpen, setReviewOpen] = createSignal(false)
+
+const tabs = {
+  all,
+  active,
+  open(tab: string) {
+    setAll((current) => (current.includes(tab) ? current : [...current, tab]))
+  },
+  setActive(tab: string) {
+    if (!all().includes(tab)) {
+      tabs.open(tab)
+    }
+    setActive(tab)
+  },
+}
+
+const view = {
+  reviewPanel: {
+    opened: reviewOpen,
+    open() {
+      setReviewOpen(true)
+    },
+  },
+}
+
+export function useLayout() {
+  return {
+    tabs: () => tabs,
+    view: () => view,
+    fileTree: {
+      setTab() {},
+    },
+    handoff: {
+      setTabs() {},
+    },
+  }
+}