Unregistered teammates bug

[Ayoobf]

Added registration check. If user is in the 'registered', 'confirmation', or 'coming' state, team creation will work. Any other state will fail

[Copilot]

Pull Request Overview

This PR adds validation to prevent unregistered users from creating teams. The change restricts team creation to users with registration status of 'registered', 'confirmation', or 'coming', blocking users in other states like 'unregistered', 'rejected', or 'waitlist'.

• Added registration status validation for team leaders and members
• Updated test fixtures to include registration status fields
• Added comprehensive test coverage for various registration status scenarios

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
src/functions/teams/create/handler.ts	Implements registration status validation logic for team creation
tests/teams-create.test.ts	Adds test coverage for registration status validation scenarios
.nvmrc	Removes Node.js version specification

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