[TX flow] UI adjustments

[usame-algan]

What it solves

Part of #2067

How this PR fixes it

• Adjusts AddressInput left spacing
• Adjust Message Sign Button alignment
• Remove unused variables/components
• Align SendToBlock and SendAmountBlock
• Change UpdateSafe title and subtitle
• Hide mobile TxChecks messages if they are empty to remove the double gap
• Hide Transaction details if tx is undefined

How to test it

Screenshots

Checklist

• I've tested the branch on mobile 📱
• I've documented how it affects the analytics (if at all) 📊
• I've written a unit/e2e test for it (if applicable) 🧑‍💻

[github-actions]

Branch preview

✅ Deploy successful!

https://tx_flow_issues--walletweb.review-wallet-web.5afe.dev

[usame-algan]

Using gap={1} results in 0px on mobile. We might need to update this in the MUI theme.

[github-actions]

ESLint Summary View Full Report

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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