fix: router should have 'pending' when loaders in progress (draft)

[lislon]

The router had a state idle, while the load and beforeLoad was not resolved.

I noticed this in tests, when I attempted to fix the warning

Warning: An update to Transitioner inside a test was not wrapped in act(...).

by waiting for state = idle.

I also noticed that Transitionier warning happens in afterEach, so I've added a unsubscribe method for history:

afterEach(() => {
  vi.resetAllMocks()
  window.history.replaceState(null, 'root', '/') <-- also causes 'Warning: An update to Transitioner inside a test was not wrapped in act(...).'

Should I expand this approach for other tests?

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commit: 85c5502