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I think a banner saying something like this:
Your wallet is over the limit, you will not be able to deposit any more sats (or receive zaps from outside of SN). Please withdraw your sats.
when their wallet is over the limit might make sense that a user can click away when they've seen it?
/cc @k00b
Working on a PR, should be ready in 15 minutes
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PR looks good to me.
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