web-wallet: Application Crash on Clearing Amount Field in Stake Flow

[nortonandreev]

Description

Clearing the amount field in the Stake flow triggers an application crash with a Not an integer exception. This issue disrupts the user experience and needs to be resolved to ensure stability.

Steps to Reproduce

1. Navigate to the Stake flow in the application.
2. Clear the amount field by deleting the default value.
3. Observe the application crash with a Not an integer exception in the Web Console.

Expected Behavior

Clearing the amount field should not cause the application to crash. Instead:

• The field should gracefully handle empty input, possibly defaulting to 0 and disabling the Next button (should mirror the behaviour of the Send flow).

Actual Behavior

The application crashes with a Not an integer exception when the amount field is cleared.

Acceptance Criteria

• Ensure clearing the amount field does not cause an application crash.
• Implement proper handling for empty or invalid input in the amount field.
• Add tests to verify the field handles empty states without errors.