chore(release): bump version to 4.2.9

[thiagoralves]

Bumps the app version to 4.2.9 ahead of the release.

• APP_VERSION in src/frontend/data/constants/app-version.ts (the single source of truth the About dialog renders, shared byte-for-byte with openplc-web).
• package.json.version set to the same value so electron-builder stamps the binary and the release tag v4.2.9 match.

Both are bumped together to avoid the About-dialog/binary drift. Web mirror PR accompanies this one.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Chores
  • Updated the application version to 4.2.9.
  • Updated the displayed version information to remain consistent across the app and packaged builds.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 4a737306-e619-4ff9-9b33-263292c1d687

📥 Commits

Reviewing files that changed from the base of the PR and between 2e134a8 and 217cf12.

📒 Files selected for processing (2)

• package.json
• src/frontend/data/constants/app-version.ts

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Walkthrough

The project package version and exported frontend application version are both updated from 4.2.8 to 4.2.9.

Changes

Version update

Layer / File(s)	Summary
Synchronize version values package.json, src/frontend/data/constants/app-version.ts	Updates the package metadata and exported APP_VERSION constant to 4.2.9.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• Autonomy-Logic/openplc-editor#852: Introduced the shared APP_VERSION constant used by this version update.
• Autonomy-Logic/openplc-editor#855: Also updated the package version and shared APP_VERSION constant.
• Autonomy-Logic/openplc-editor#864: Modified the same two version fields for a release bump.

Suggested reviewers: joaogsp

Poem

I’m a rabbit with a versioned beat,
4.2.9 makes the release complete.
Package and app hop side by side,
In matching numbers, ears held wide.
Carrots for every synchronized stride!

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description summarizes the change but omits the required template sections, including References and the DOD checklist.	Add the template sections for Pull request info, References, Description of the changes proposed, and the full DOD checklist.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title is concise and accurately summarizes the main change: bumping the release version to 4.2.9.
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.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/app-version-4.2.9

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