🧪 [testing improvement] Add unit test coverage for setupAppDict() in AppDelegate

[hatimhtm]

🎯 What: The testing gap addressed
The setupAppDict() method in AppDelegate.swift correctly maps application names, but was previously entirely untested. I've created the Click2MinimizeTests unit testing target and added AppDelegateTests.swift.

📊 Coverage: What scenarios are now tested
A new XCTest test checks that appDict initializes correctly, setupAppDict() populates the dictionary as intended, and specific values for keys "Visual Studio Code" and "Rosetta Stone Learn Languages" match the required mapping correctly.

✨ Result: The improvement in test coverage
Test coverage increases explicitly for a known core dictionary function within the application delegate. It ensures these mappings are protected against regression. I configured the xcodeproj files correctly such that tests can be verified using the default scheme (Click2Minimize).

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PR created automatically by Jules for task 17117186431560092587 started by @hatimhtm

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