Add configurable vibe presets

src/utils/browser-storage.ts

@@ -0,0 +1,18 @@
+export const readBrowserStorage = (key: string): string | null => {
+  try {
+    return localStorage.getItem(key);
+  } catch {
+    return null;
+  }
+};
+
+export const writeBrowserStorage = (key: string, value: string): void => {
+  try {
+    localStorage.setItem(key, value);
+  } catch (error) {
+    console.warn(
+      'Storage can be unavailable in private browsing or embedded contexts.',
+      error
+    );
+  }
+};