feat: openapi-fetch typing

feat: base page layout for implementation

todo: fix light/dark mode toggling

web/src/stores/theme.ts

@@ -0,0 +1,35 @@
+import { writable } from 'svelte/store';
+
+function getInitialDark(): boolean {
+	if (typeof window === 'undefined') return false;
+	try {
+		const saved = localStorage.getItem('color-scheme');
+		if (saved === 'dark') return true;
+		if (saved === 'light') return false;
+		return window.matchMedia && window.matchMedia('(prefers-color-scheme: dark)').matches;
+	} catch {
+		return false;
+	}
+}
+
+export const darkMode = writable<boolean>(getInitialDark());
+
+export function setDarkMode(value: boolean): void {
+	darkMode.set(value);
+}
+
+export function toggleDarkMode(): void {
+	darkMode.update((v) => !v);
+}
+
+if (typeof window !== 'undefined') {
+	darkMode.subscribe((isDark) => {
+		const root = document.documentElement;
+		root.classList.toggle('dark', isDark);
+		try {
+			localStorage.setItem('color-scheme', isDark ? 'dark' : 'light');
+		} catch {
+			// ignore storage write errors
+		}
+	});
+}