refactor(app): extract page logic into composable drivers

src/composables/page-drivers/useSettingsPage.ts

@@ -0,0 +1,13 @@
+import { computed } from 'vue'
+
+export interface SettingsPageModel {
+  title: string
+}
+
+export function useSettingsPage() {
+  const pageModel = computed<SettingsPageModel>(() => ({
+    title: '設定頁面',
+  }))
+
+  return { pageModel }
+}