add new sveltekit frontend

frontend/src/lib/store.ts

@@ -0,0 +1,14 @@
+import { writable } from "svelte/store";
+import { browser } from "$app/environment";
+
+import type { MeUser } from "./api/entities";
+
+export const userStore = writable<MeUser | null>(null);
+export const tokenStore = writable<string | null>(null);
+
+let defaultThemeValue = "dark";
+const initialThemeValue = browser
+  ? window.localStorage.getItem("pronouns-theme") ?? defaultThemeValue
+  : defaultThemeValue;
+
+export const themeStore = writable<string>(initialThemeValue);