Ether Deposit - add validation on change and display balance

[brunomenezes]

📄 Context

The Ether deposit form is quite simple, but it lacks helpful information for those who use it. e.g. Quick feedback on error messages and display the current balance of the connected account.

✔️ Solution

Apply validation as the amount changes for quick feedback. Also, include the current formatted balance with the possibility to click the max button.

📈 Subtasks

• Change the logic to apply validation on change.
• Add the balance information below the amount input, including a max action to auto-fill the input.
• Add test cases.

🎯 Definition of Done

• I can see error messages as I type the amount and the validation fails.
• I can see the current balance of my connected account.
• CI builds are passing.
• Vercel builds are complete.