Account Switcher

[weisintai]

For users to switch between accounts.

• Can have just one section for users to switch accounts with, no need to follow the reference strictly.
• Change "Create Team" to "Create Account" and implement the Create Account feature.
• Add isDefault field for users to select which account they want to see by default, the current implementation is just grabbing the first result the database returned.

Zustand is used to manage the global state on client side to store the currently selected account, when the user select an account, should invoke the "changeAccount" function from the store and everything should react from there.

[weisintai]

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