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> is it safe to add labels and keep pressing “yes” when it asks me “would you like to add labels”
Yes.
> technically accessing my seed to add the label
Kiiiinda but not really in a way that matters.
> if a hacker makes something that when you press yes for the labels it sends all my coins to them
This is a reasonable worry, but it can’t really work in this case.
First of all, Suite asks Trezor to use keys that are wholly separate from any keys you use for your coins.
A hacker could perhaps subvert that and tell Trezor to use the same keys, but…
…before doing anything, Trezor adds some more data to the keys, then mangles them by a one-way function, and uses the result as an encryption/decryption key (of a _completely different type_ than anything you sign your coins with) to calculate the result the Suite is asking for.
At start, there is something that plausibly has the power to transact with your coins. At the end, it’s changed beyond recognition, so there is no way a hacker can use the result for anything nefarious.