fix(frontend): stabilize multiselect behavior and UI spacing (#154)

* fix(frontend): left-align announcement logo in homepage banner

* fix(frontend): keep multiselect panels floating and preserve summaries

* fix(frontend): rebalance config card header spacing

* fix(frontend): normalize formatting and fix multiselect modal behavior

* fix(frontend): restore config divider spacing on desktop

vite-frontend/src/pages/limit.tsx

@@ -1,4 +1,6 @@
 import { useState, useEffect } from "react";
+import toast from "react-hot-toast";
+
 import { Card, CardBody, CardHeader } from "@/shadcn-bridge/heroui/card";
 import { Button } from "@/shadcn-bridge/heroui/button";
 import { Input } from "@/shadcn-bridge/heroui/input";
@@ -11,8 +13,6 @@ import {
   ModalFooter,
 } from "@/shadcn-bridge/heroui/modal";
 import { Chip } from "@/shadcn-bridge/heroui/chip";
-import toast from "react-hot-toast";
-
 import {
   createSpeedLimit,
   getSpeedLimitList,