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/components/dialog-select-model-unpaid.tsx

@@ -0,0 +1,3 @@
+export function DialogSelectModelUnpaid() {
+  return <div data-component="dialog-select-model-unpaid">Select model</div>
+}

packages/storybook/.storybook/mocks/app/components/dialog-select-model.tsx

@@ -0,0 +1,7 @@
+import { splitProps } from "solid-js"
+
+export function ModelSelectorPopover(props: { triggerAs: any; triggerProps?: Record<string, unknown>; children: any }) {
+  const [local] = splitProps(props, ["triggerAs", "triggerProps", "children"])
+  const Trigger = local.triggerAs
+  return <Trigger {...(local.triggerProps ?? {})}>{local.children}</Trigger>
+}