[ENHANCEMENT] [pixles-swift] Setup all the necessary testing frameworks

[justin13888]

Feature Description

Need to setup some testing tools ahead of time (some are optional):

• XCTest - Apple's built-in framework for unit testing
• XCUITest - For UI automation testing
• Quick and Nimble - BDD-style testing frameworks for more readable tests
• ViewInspector - For testing SwiftUI views
• SnapshotTesting - Compares UI components against reference images
• OHHTTPStubs/Mocker - For mocking network responses in tests
• Coverage reports - Tools like Slather or xcov to measure test coverage

Target Component

• pixles-api
• pixles-core-kotlin
• pixles-desktop
• pixles-docs
• pixles-media
• pixles-swift
• pixles-web
• Other: _____________________