docs(readme): document DynamicTheme

[javier-godoy]

Summary by CodeRabbit

• Documentation
  • Added comprehensive guide for dynamic theme switching in Vaadin 25+, covering runtime configuration for Lumo and Aura themes with initialization examples
  • Included instructions for removing legacy theme references to support the new approach

[coderabbitai]

Walkthrough

README.md is enhanced with a new "Dynamic Theme" section documenting Vaadin 25+ runtime theme switching capabilities. The addition includes code examples demonstrating DynamicTheme API usage with AppShellConfigurator, configuration instructions, and migration guidance from legacy theme declarations.

Changes

Cohort / File(s)	Summary
Documentation README.md	Added "Dynamic Theme" section with Vaadin 25+ runtime theme switching documentation, AppShellConfiguratorImpl code example, image reference, and migration instructions for removing legacy @Theme and @StyleSheet annotations.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Possibly related PRs

• feat: add support for dynamic theme switching #140: Documents and demonstrates the DynamicTheme API and AppShellConfigurator implementation that was introduced in that PR.

Suggested reviewers

• paodb
• mlopezFC

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The pull request title accurately and concisely describes the main change: documenting DynamicTheme in the README file.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs-dynamic-theme

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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