make dark theme as default

app/lib/stores/theme.ts

@@ -9,16 +9,16 @@ export function themeIsDark() {
   return themeStore.get() === 'dark';
 }
 
-export const DEFAULT_THEME = 'light';
+export const DEFAULT_THEME = 'dark';
 
 export const themeStore = atom<Theme>(initStore());
 
-function initStore() {
+function initStore(): Theme {
   if (!import.meta.env.SSR) {
-    const persistedTheme = localStorage.getItem(kTheme) as Theme | undefined;
+    const persistedTheme = localStorage.getItem(kTheme) || (DEFAULT_THEME as Theme | undefined);
     const themeAttribute = document.querySelector('html')?.getAttribute('data-theme');
 
-    return persistedTheme ?? (themeAttribute as Theme) ?? DEFAULT_THEME;
+    return (persistedTheme ?? themeAttribute) as Theme;
   }
 
   return DEFAULT_THEME;