Add Stationery and Stationery Dark themes with notebook chrome.

Manila folders, ruled chat, post-it nav, and folder tabs; dark variant uses Catppuccin Mocha colors with muted stickies and soft glows.

src/index.tsx

@@ -3,6 +3,9 @@ import React from 'react';
 import { createRoot } from 'react-dom/client';
 import { enableMapSet } from 'immer';
 import '@fontsource-variable/inter';
+import '@fontsource/caveat/500.css';
+import '@fontsource/caveat/600.css';
+import '@fontsource/caveat/700.css';
 import 'folds/dist/style.css';
 import { configClass, varsClass } from 'folds';