feat(wallet/dashboard): show negative value for vested staking

[evavirseda]

Description of change

Links to any relevant issues

fixes #6742

Type of change

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• Bug fix (a non-breaking change which fixes an issue)
• Enhancement (a non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Fix

How the change has been tested

Describe the tests that you ran to verify your changes.

Make sure to provide instructions for the maintainer as well as any relevant configurations.

• Basic tests (linting, compilation, formatting, unit/integration tests)
• Patch-specific tests (correctness, functionality coverage)

Infrastructure QA (only required for crates that are maintained by @iotaledger/infrastructure)

• Synchronization of the indexer from genesis for a network including migration objects.
• Restart of indexer synchronization locally without resetting the database.
• Restart of indexer synchronization on a production-like database.
• Deployment of services using Docker.
• Verification of API backward compatibility.

Change checklist

Tick the boxes that are relevant to your changes, and delete any items that are not.

• I have followed the contribution guidelines for 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
• I have added tests that prove my fix is effective or that my feature works
• I have checked that new and existing unit tests pass locally with my changes

Release Notes

• Protocol:
• Nodes (Validators and Full nodes):
• Indexer:
• JSON-RPC:
• GraphQL:
• CLI:
• Rust SDK:
• REST API:

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Name	Status	Preview	Comments	Updated (UTC)
apps-backend	⬜️ Ignored (Inspect)	Visit Preview		May 19, 2025 2:23pm
apps-ui-kit	⬜️ Ignored (Inspect)	Visit Preview	💬 Add feedback	May 19, 2025 2:23pm
rebased-explorer	⬜️ Ignored (Inspect)	Visit Preview		May 19, 2025 2:23pm
wallet-dashboard	⬜️ Ignored (Inspect)	Visit Preview	💬 Add feedback	May 19, 2025 2:23pm

[brancoder]

LGTM

[KeitoTadashi]

Works! 💪