feat: include placeholderValue in SourceTreeElement JSON format

[gmegidish]

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 947ed911-1fac-48c7-8772-c3d7bba583ac

📥 Commits

Reviewing files that changed from the base of the PR and between 88c38aa and 8bcd59c.

📒 Files selected for processing (1)

• DeviceKitTests/XCTest/AXElement.swift

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Walkthrough

A new optional placeholderValue property of type String? has been added to the SourceTreeElement Codable data model. The property is initialized from the corresponding placeholderValue attribute of the source axElement object within the init(axElement:) initializer. This change extends the SourceTreeElement schema to capture and store placeholder value information without modifying any other existing properties or initialization logic.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided by the author, making it impossible to assess relevance to the changeset.	Add a pull request description explaining the purpose and context of including placeholderValue in SourceTreeElement.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and specifically describes the main change: adding placeholderValue to SourceTreeElement's JSON format.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/placeholder-value

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