feat(dashboard): implement invoice kanban board view and fix diff utilities

[Luchistack]

#closes #402

Description

• Implemented the invoice Kanban board view for better state management and visualization.
• Updated the invoiceDiff utility test suite to properly serialize BigInt values using a custom replacer function, resolving serialization errors during test execution.
• Ensured all tests pass successfully.

Related Issue

• Closes Invoice Kanban Board View #402 (Invoice Kanban Board View)

Testing

• Verified via Vitest: npx vitest run src/__tests__/invoiceMergeTool.test.ts

#closes

[vercel]

@Luchistack is attempting to deploy a commit to the kingsman-99's projects Team on Vercel.

A member of the Team first needs to authorize it.

[drips-wave]

@Luchistack Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits