feat(core): Wave 1 part1 — 浮层进场动画/ESC + Toast 归正 + 账户表横线

S4 浮层: overlays.tsx 新增共享 useOverlayTransition(挂载→下一帧上 .show 触发
  scale(.96→1)/translateX 进场过渡;关闭先撤 .show 播退场再卸载)+ 统一 ESC 关闭,
  应用 TeamModal/ConfirmModal/SuccessModal/Drawer;EmptyPanel 补 .ic-empty 灰 icon
S3 Toast: ToastLike 改用设计系统 .toast(右下/单橙 ic-t/shadow-floating/滑入),
  不再随 success/error 变绿红边;auth login-toast → .toast
S9 表格: account-page.css 删 tbody td border-bottom(对照 V1 account.html 确认应无行线)

验证: tsc 0 · 交互走查 toast出现+ESC关弹窗 · 14 路由回归 boot 0 报错 · 登录 643ms

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

core/frontend/src/routes/auth-screen.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useRef, useState } from "react";
 import type { FormEvent } from "react";
-import { Eye, EyeOff, LockKeyhole, UserRound } from "lucide-react";
+import { Eye, EyeOff, Info, LockKeyhole, UserRound } from "lucide-react";
 import { api, getRemember, setRemember as persistRemember } from "../api";
 import type { Team, User } from "../types";
 import type { AuthMode } from "./route-config";
@@ -173,7 +173,12 @@ export function AuthScreen({
           </button>
         </div>
       </div>
-      {toast && <div className="login-toast"><div>{toast.title}</div><span>// {toast.sub}</span></div>}
+      {toast && (
+        <div className="toast show" role="status" aria-live="polite">
+          <div className="ic-t"><Info size={13} aria-hidden="true" /></div>
+          <div className="txt">{toast.title}<span className="mono">// {toast.sub}</span></div>
+        </div>
+      )}
     </main>
   );
 }