Router only checks that `window.history.state` isn't empty, breaks when used with other frameworks

[ariel-codes]

Versions:

• @inertiajs/core version: 1.2.0
• @inertiajs/vue2 version: #.#.#
• @inertiajs/vue3 version: #.#.#
• @inertiajs/react version: 1.2.0
• @inertiajs/svelte version: #.#.#

Describe the problem:

When navigating back/forward from pages, the router only checks that window.history.state is not empty, but this can conflict with other navigation frameworks (in my case Turbo/Hotwire, which uses window.history.state.turbo). This in turn leads to the resolve function passed to createInertiaApp being called with an undefined arg.

Steps to reproduce:

• Set window.history.state to any truthy value before initializing Inertia