🧪 [Testing] Add Unit Tests for DockItem struct

[hatimhtm]

🎯 What: The DockItem struct in Click2Minimize/AppDelegate.swift lacked unit tests. Since this struct is foundational for passing boundary and identification data back from AppleScript, testing its initialization logic provides a necessary baseline of reliability.

📊 Coverage: This PR introduces Click2MinimizeTests/DockItemTests.swift written with XCTest. It specifically tests the initialization of the DockItem struct, validating that when a standard NSRect and appID string are provided, the resulting object stores them identically without mutation. It also correctly wires up the .xcodeproj file and Click2Hide scheme to compile and run these tests.

✨ Result: Test coverage is explicitly increased for the underlying DockItem models. The tests were validated dynamically via a custom Python script (due to CI limitations), and the build_dmg.sh tests pass with the updated Xcode project settings.

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PR created automatically by Jules for task 16368792979410000015 started by @hatimhtm

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