I checked through the other references to `navigate` and none of them
appeared to be affected.

Small changes to the e2e tests to improve the stability.

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Added onboarding and budget e2e tests. Also fixed an issue for
first-time flows using imports: currently people end up with a blank
white screen after importing. Instead they should see the budget table.

Related: https://github.com/actualbudget/actual/issues/583