feat: UI improvements — scrollbar, multi-filters, pricing fix, routing, modals

- Global page scrollbar styled with gold theme
- Schedule: multi-select for class types and status tags
- Pricing: fix tab switch blink (display toggle vs conditional render)
- OpenDay: trainer name more prominent, section divider added
- Team: browser back button closes trainer bio (history API)
- Modals: block scroll + compensate scrollbar width to prevent layout shift
- Header: remove booking button from desktop nav

src/components/sections/OpenDay.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useState, useMemo } from "react";
-import { Calendar, Users, Sparkles } from "lucide-react";
+import { Calendar, Sparkles } from "lucide-react";
 import { SectionHeading } from "@/components/ui/SectionHeading";
 import { Reveal } from "@/components/ui/Reveal";
 import { SignupModal } from "@/components/ui/SignupModal";
@@ -48,7 +48,8 @@ export function OpenDay({ data, popups }: OpenDayProps) {
   if (classes.length === 0) return null;
 
   return (
-    <section id="open-day" className="py-10 sm:py-14">
+    <section id="open-day" className="section-glow relative py-10 sm:py-14">
+      <div className="section-divider absolute top-0 left-0 right-0" />
       <div className="mx-auto max-w-6xl px-4">
         <Reveal>
           <SectionHeading centered>{event.title}</SectionHeading>
@@ -179,11 +180,8 @@ function ClassCard({
       <div className="flex items-start justify-between gap-3">
         <div className="flex-1 min-w-0">
           <span className="text-xs text-gold font-medium">{cls.startTime}–{cls.endTime}</span>
-          <p className="text-sm font-medium text-white mt-0.5">{cls.style}</p>
-          <p className="text-xs text-neutral-400 flex items-center gap-1 mt-0.5">
-            <Users size={10} />
-            {cls.trainer}
-          </p>
+          <p className="text-sm font-bold text-white mt-1">{cls.trainer}</p>
+          <p className="text-xs text-neutral-400 mt-0.5">{cls.style}</p>
           {maxParticipants > 0 && (
             <p className={`text-[10px] mt-1 ${isFull ? "text-amber-400" : "text-neutral-500"}`}>
               {cls.bookingCount}/{maxParticipants} мест