ari_assistant/frontend/components/settings/AppearanceTab.tsx

// frontend/components/settings/AppearanceTab.tsx — 테마(라이트/다크) — next-themes 실제 적용
"use client";
import { useEffect, useState } from "react";
import { useTheme } from "next-themes";
import { Icon } from "@/components/Icon";
import type { ToastFn } from "./SettingsClient";

const THEMES = [
  { id: "light", label: "라이트", icon: "sun" as const, desc: "밝은 글래스" },
  { id: "dark", label: "다크", icon: "moon" as const, desc: "어두운 글래스" },
];

export function AppearanceTab({ toast }: { toast: ToastFn }) {
  const { theme, resolvedTheme, setTheme } = useTheme();
  const [mounted, setMounted] = useState(false);
  useEffect(() => setMounted(true), []);

  const current = mounted ? (resolvedTheme ?? theme ?? "light") : "light";

  const pick = (id: string) => {
    setTheme(id);
    toast(`${id === "dark" ? "다크" : "라이트"} 테마로 바꿨어요`, "blue");
  };

  return (
    <section className="set-sec" aria-label="외관">
      <header className="set-sechead">
        <h2>외관</h2>
        <p>테마는 이 브라우저에 저장돼요.</p>
      </header>

      <div className="set-card">
        <div className="set-field">
          <label>테마</label>
          <div className="set-themes" role="radiogroup" aria-label="테마 선택">
            {THEMES.map((t) => (
              <button
                key={t.id}
                type="button"
                role="radio"
                aria-checked={current === t.id}
                className={"set-theme th-" + t.id + (current === t.id ? " on" : "")}
                onClick={() => pick(t.id)}
              >
                <span className="th-preview" aria-hidden>
                  <i className="th-bar" />
                  <i className="th-dot" />
                </span>
                <span className="th-label">
                  <Icon name={t.icon} />
                  <b>{t.label}</b>
                  <small>{t.desc}</small>
                </span>
                {current === t.id && <span className="th-check" aria-hidden><Icon name="tick" /></span>}
              </button>
            ))}
          </div>
        </div>
      </div>
    </section>
  );
}