🐞 fix: Balance and Token Usage Improvements

[danny-avila]

Summary

This set of changes focuses on improving the handling of balance and token usage. The primary changes include:

• Ensures token usage is recorded correctly for OpenAIClient: titleConvo when set to completion title method.
• Fixes an incomplete condition for OpenAIClient: titleConvo introduced by Cohere handling: 🧠 feat: Cohere support as Custom Endpoint #2328
• Refactors the NavLinks component to display the user's balance with a maximum of two decimal places.
• Fixes an issue where a zero balance was not rendered properly in the NavLinks component.
• Prevents negative multiplier edge case when recording balance transactions
  • Also handles the specific openrouter/auto edge case in the processModelData related to this: Token Balance keep accumulating when using OpenRouter Auto #2349
• Ensures the user's balance cannot become negative when creating transactions, a minimum of 0 is now enforced.

Change Type

• Bug fix (non-breaking change which fixes an issue)

Checklist

• My code adheres to this project's style guidelines
• I have performed a self-review of my own code
• I have commented in any complex areas of my code
• I have made pertinent documentation changes
• My changes do not introduce new warnings
• I have written tests demonstrating that my changes are effective or that my feature works
• Local unit tests pass with my changes
• Any changes dependent on mine have been merged and published in downstream modules