feat: add icon for settings and theme

[javier-godoy]

Summary by CodeRabbit

• New Features
  • Added Settings and Theme icons to the Commons Demo icon set.
  • The new icons are available for use throughout the interface.

[coderabbitai]

Walkthrough

Changes

Demo icon additions

Layer / File(s)	Summary
Icon names and SVG assets base/src/main/java/com/flowingcode/vaadin/addons/demo/CommonsDemoIcons.java, base/src/main/resources/META-INF/resources/frontend/commons-demo-iconset.ts	The public enum adds SETTINGS and THEME, and the commons-demo iconset registers matching settings and theme SVG entries.

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

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
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.
Title check	✅ Passed	The title clearly matches the main change: adding settings and theme icons.

✨ 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 more-icons

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud