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/comments.ts

@@ -0,0 +1,34 @@
+import { createSignal } from "solid-js"
+
+type Comment = {
+  id: string
+  file: string
+  selection: { start: number; end: number }
+  comment: string
+  time: number
+}
+
+const [list, setList] = createSignal<Comment[]>([])
+const [focus, setFocus] = createSignal<{ file: string; id: string } | null>(null)
+const [active, setActive] = createSignal<{ file: string; id: string } | null>(null)
+
+export function useComments() {
+  return {
+    all: list,
+    replace(next: Comment[]) {
+      setList(next)
+    },
+    remove(file: string, id: string) {
+      setList((current) => current.filter((item) => !(item.file === file && item.id === id)))
+    },
+    clear() {
+      setList([])
+      setFocus(null)
+      setActive(null)
+    },
+    focus,
+    setFocus,
+    active,
+    setActive,
+  }
+}