feat: add intentional reader routes

src/routes/user.tsx

@@ -0,0 +1,25 @@
+import { createFileRoute } from '@tanstack/react-router'
+import { AppShell } from '#/components/app-shell'
+import { UserForm } from '#/features/posts/components/user-form'
+import { userRouteSearchSchema } from '#/features/posts/inputs'
+
+export const Route = createFileRoute('/user')({
+  validateSearch: (search) => userRouteSearchSchema.parse(search),
+  component: UserRoute,
+})
+
+function UserRoute() {
+  const { target } = Route.useSearch()
+  const navigate = Route.useNavigate()
+  return (
+    <AppShell active="user">
+      <h1>誰の投稿を見ますか？</h1>
+      <p className="intro">履歴やおすすめは表示しません。</p>
+      <UserForm
+        initialTarget={target}
+        key={target}
+        onSubmit={(nextTarget) => navigate({ search: { target: nextTarget } })}
+      />
+    </AppShell>
+  )
+}