fix: enhance phone number input UX

[danielsp45]

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[reviewpad]

AI-Generated Summary: This pull request by daniel_sp makes minor changes to the phone number input UX in the registration component. It updates the validation pattern for phone numbers, by removing the country code requirement. In addition, the placeholder text is also updated to reflect this pattern change. This would likely make it easier for users to enter phone numbers as they no longer have to provide the country code.

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