feat: add live earnings mode

[syed-ghufran-hassan]

Description

• simulate per-second earnings based on APY and duration
• add toggle to enable/disable live mode
• reset live earnings on input changes
• integrate with existing earnings animation

Type of change

Please check the relevant option(s):

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Performance improvement
• Code refactoring
• Dependency update

How Has This Been Tested?

Please describe the tests you ran to verify your changes:

• Tested locally
• Tested on testnet
• Added unit tests
• Manual testing

Checklist

Please check all that apply:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published

Screenshots (if applicable)

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Related Issues

Closes #(issue number)
Fixes #(issue number)
Relates to #(issue number)

Additional Notes

Any additional information or context about the PR.

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