feat(ui): 统一登录与会话页的 shadcn 交互组件

登录页切换为官方 input-group 组合并将全站提示从 antd message 统一为 sonner toast，确保通知位置与风格一致。同时补齐相关 shadcn CLI 生成组件及构建配置更新。

Co-authored-by: Cursor <cursoragent@cursor.com>

vite.config.ts

@@ -2,8 +2,14 @@ import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 import Pages from "vite-plugin-pages";
 import tailwindcss from "@tailwindcss/vite";
+import path from "node:path";
 
 export default defineConfig({
+  resolve: {
+    alias: {
+      "@": path.resolve(__dirname, "./src"),
+    },
+  },
   plugins: [
     react(),
     Pages({