Implements ThemeUpdateListening Unit Tests

[jleandroperez]

Task/Issue URL: https://app.asana.com/1/137249556945/project/1211150618152277/task/1211631983666272?focus=true
Tech Design URL:
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Description

In this PR we're implementing Unit Tests for the ThemeUpdateListening protocol.

@diegoreymendez May I trouble you with a really really small PR?

Thanks in advance!!

Testing Steps

• Please verify the Unit Tests are green

Impact and Risks

None: Internal tooling, documentation

What could go wrong?

Nothing. This PR implements new Unit Tests, zero code from the main target is modified.

Quality Considerations

Nothing in particular

Notes to Reviewer

Thank you!

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Internal references:

Definition of Done | Engineering Expectations | Tech Design Template

[Copilot]

Pull Request Overview

This PR implements unit tests for the ThemeUpdateListening protocol to improve test coverage for theme management functionality.

• Adds comprehensive unit tests for ThemeUpdateListening protocol functionality
• Creates a sample implementation for testing theme update behavior
• Validates that theme changes trigger proper callback invocation on the main thread

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ThemeUpdateListeningTests.swift	New test file implementing unit tests for the ThemeUpdateListening protocol with mock implementation
project.pbxproj	Xcode project configuration updates to include the new test file in build targets

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