docs: add changelog for 1.4.1

[gunoooo]

Summary

• Add CHANGELOG entry for version 1.4.1

Summary by CodeRabbit

• New Features

  • Added sourceType field to event tracking for SESSION_START, PUSH_NOTIFICATION_RECEIVED, and PUSH_NOTIFICATION_TAPPED events.

• Documentation

  • Updated changelog for version 1.4.1.

[coderabbitai]

Walkthrough

Version 1.4.1 changelog entry added, documenting the introduction of a sourceType field to event tracking for SDK-internal events including SESSION_START, PUSH_NOTIFICATION_RECEIVED, and PUSH_NOTIFICATION_TAPPED.

Changes

Cohort / File(s)	Summary
Changelog CHANGELOG.md	Added version 1.4.1 entry (dated 2026-02-13) documenting the addition of sourceType field to event tracking for SDK-internal events.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding a changelog entry for version 1.4.1 to the CHANGELOG.md file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into main

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-changelog

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