feat: add sign transaction tests

[esaminu]

Adds tests and assertions for the sign transaction page

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Name	Status	Preview	Comments	Updated (UTC)
fast-auth-signer	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 31, 2024 2:52pm

[hcho112]

left few comments, also I have changed quite a bit on my branch so maybe worth rebase my branch now? (or lets get my PR merged first?)

[hcho112]

another rebase and it should be good to go

[hcho112]

maybe we need to revisit the test failure