c.var.client has syntaxCallback bug in Hono routes

[mrkmadsn]

When` using c.var.client in custom Hono routes (router.ts), it throws:

TypeError: endOptions.syntaxCallback is not a function
Use Case: Webhooks need to update Blade Account data from external services (e.g., Stripe subscription status). According to the docs, c.var.client should work for this.

Code Example:

 // router.ts
app.post('/webhook', async (c) => {
  // @ts-expect-error - Blade provides client via c.var but types aren't exported
  const bladeClient = c.var.client;
  if (bladeClient?.set) {
    await bladeClient.set.account({
      with: { id: accountId },
      to: { subscriptionStatus: 'active' },
    });
  }
});

Expected: Should update Blade Account records Actual: Throws syntaxCallback error

This prevents using Blade as the source of truth for external webhook data, requiring client-side fetching instead of instant server-side data.