first commit

app/lib/stores/theme.ts

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+import { atom } from 'nanostores';
+
+export type Theme = 'dark' | 'light';
+
+export const kTheme = 'bolt_theme';
+
+export function themeIsDark() {
+  return themeStore.get() === 'dark';
+}
+
+export const DEFAULT_THEME = 'light';
+
+export const themeStore = atom<Theme>(initStore());
+
+function initStore() {
+  if (!import.meta.env.SSR) {
+    const persistedTheme = localStorage.getItem(kTheme) as Theme | undefined;
+    const themeAttribute = document.querySelector('html')?.getAttribute('data-theme');
+
+    return persistedTheme ?? (themeAttribute as Theme) ?? DEFAULT_THEME;
+  }
+
+  return DEFAULT_THEME;
+}
+
+export function toggleTheme() {
+  const currentTheme = themeStore.get();
+  const newTheme = currentTheme === 'dark' ? 'light' : 'dark';
+
+  themeStore.set(newTheme);
+
+  localStorage.setItem(kTheme, newTheme);
+
+  document.querySelector('html')?.setAttribute('data-theme', newTheme);
+}