✨ Focus next in stack

[mrkai77]

• Adds new function to focus the next window in a stacked configuration.
• Introduces a new NavigationDirection enum for use in DirectionalNavigationUtility, as leading and trailing do not stay consistent between LTR and RTL layouts.

[Copilot]

Pull request overview

This PR adds a new function to focus the next window in a stacked configuration and introduces a NavigationDirection enum to replace Edge for directional navigation. This change ensures consistent behavior between LTR (left-to-right) and RTL (right-to-left) layouts.

• Introduces a new NavigationDirection enum with absolute directions (.left, .right, .top, .bottom) instead of layout-dependent directions (.leading, .trailing)
• Adds cycleInStack function to the DirectionalNavigationUtility for cycling through overlapping windows
• Updates API signatures from edge: Edge to direction: NavigationDirection throughout the codebase

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 7 comments.

File	Description
Loop/Utilities/DirectionalNavigationUtility.swift	Introduces NavigationDirection enum, adds cycleInStack function for stacked window navigation, renames parameters for clarity, and adds filterItemsBySharedArea helper function
Loop/Utilities/ScreenUtility.swift	Updates directionalScreen function signature to use NavigationDirection instead of Edge, and updates parameter names
Loop/Core/LoopManager.swift	Updates screen and window focus navigation calls to use NavigationDirection, adds handling for focusNextInStack action
Loop/Localizable.xcstrings	Adds localization string for "Focus Next In Stack" window action

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