Add timezone selection when creating a new account.

[odeinjul]

Describe the feature

Give the user an opportunity to choose the right timezone when creating a new account.

Why is this feature important?

Currently, there’s no option to select the correct timezone during account creation—it can only be set afterwards in the settings.

Here’s a possible user flow and issue:

• The user creates a new account.
• The user adds some data. (At this point, the net worth is incorrect if the user has multi-currency assets, since no API key is set and exchange rates are outdated.)
• The user adds the API key. (Now the net worth becomes correct.)
• The user changes the timezone to the correct one (e.g., from UTC to UTC-6).

Problem: After step 4, the net worth statistics may become inaccurate again, because the update is treated as happening in the future relative to the new timezone, and thus isn’t reflected in the net worth.

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Maybe this should be categorized as a bug but I think every components is working correctly here, except the issue when changing the timezone. Therefore allow the user to set the timezone at the beginning should fix this.

Additional context, screenshots, and relevant links

No response