static/theme.js

let theme = localStorage.getItem("nexus_theme") || "dark";

function applyTheme(t) {
  theme = t;
  document.body.className = t;
  localStorage.setItem("nexus_theme", t);
}

document.addEventListener("DOMContentLoaded", async () => {
  applyTheme(theme);
  try {
    const res = await fetch("/api/settings", { credentials: "include" });
    if (res.ok) {
      const data = await res.json();
      if (data.settings && data.settings.theme) {
        applyTheme(data.settings.theme);
      }
    }
  } catch {}
});