Fix leverage picker crash when opening perpetual position

[gemdev111]

• Fix array index out of bounds crash in SwiftUI Picker when opening perpetual position
• Add LeverageOption.option(desiredValue:from:) to select closest valid leverage option
• Add unit tests for leverage option selection

closes #1505

[gemini-code-assist]

Summary of Changes

Hello @gemdev111, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request provides a critical fix for a crash that occurred in the SwiftUI Picker when users attempted to open a perpetual position. The core of the solution involves enhancing the leverage option selection mechanism to prevent out-of-bounds errors by always choosing a valid, closest available leverage value. This ensures a more stable and reliable user experience during position opening.

Highlights

• Crash Fix: Resolved an array index out of bounds crash in the SwiftUI Picker when opening a perpetual position.
• Leverage Option Selection: Introduced a new static method LeverageOption.option(desiredValue:from:) to intelligently select the closest valid leverage option from a given list.
• Unit Tests: Added comprehensive unit tests for the new leverage option selection logic to ensure its correctness and robustness.

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[gemini-code-assist]

Code Review

This pull request effectively resolves a crash that occurred when opening a perpetual position by ensuring the selected leverage is always a valid option. The introduction of the LeverageOption.option(desiredValue:from:) method to find the closest available leverage is a solid approach, and it's great to see it backed by a comprehensive set of unit tests. My review includes one suggestion to enhance the readability of the new logic.