chore: bump version to 3.1.1 in package.json; refactor mobile navigation components and improve layout structure (#472)

- Updated version to 3.1.1 in package.json.
- Refactored mobile navigation components to enhance structure and usability.
- Adjusted layout components to improve responsiveness and visual consistency.
- Introduced shared mobile navigation components for better code reuse.

packages/billing/stripe/src/schema/stripe-client-env.schema.ts

@@ -4,9 +4,7 @@ const isHostedMode = process.env.STRIPE_UI_MODE === 'hosted_page';
 
 export const StripeClientEnvSchema = z
   .object({
-    publishableKey: isHostedMode
-      ? z.string().optional()
-      : z.string().min(1),
+    publishableKey: isHostedMode ? z.string().optional() : z.string().min(1),
   })
   .refine(
     (schema) => {