feat(ui): introduces storybook

- adds the necessary dependencies and configuration for Storybook.
- refactors the `Button` component and adds some stories for it.

pkgs/clan-app/ui/tsconfig.json

@@ -1,4 +1,8 @@
 {
+  "exclude": [
+    // ignore storybook stories
+    "**/*.stories.tsx"
+  ],
   "compilerOptions": {
     "strict": true,
     "target": "ESNext",