Fix/deprecations memory leak entitlements

[vksvicky]

This PR fixes multiple issues related to macOS 14 compatibility, compiler warnings, and a memory leak.

Description

• ✅ Updated macOS deployment target from 13.0 to 14.0
• ✅ Fixed 80+ SwiftUI onChange(of:perform:) deprecation warnings
• ✅ Fixed unreachable code warning in LSPService.swift
• ✅ Added required app entitlements for file access (fixes crash on file dialogs)
• ✅ Fixed memory leak in CurrentUser.getCurrentUser()

Related Issues

#2133

Checklist

• [X] I read and understood the contributing guide as well as the code of conduct
• [X] The issues this PR addresses are related to each other
• [X] My changes generate no new warnings
• [X] My code builds and runs on my machine
• [] My changes are all related to the related issue above
• [] I documented my code

Screenshots