Add Vaadin 25 compatibility

[paodb]

This PR addresses necessary updates so the component is compatible with Vaadin 25.

This includes:

• add dependency gwt-elemental
• avoid use of commons.lang3
• add AppShellConfiguratorImpl
• update version to 2.1.0-SNAPSHOT

Summary by CodeRabbit

• Chores
  • Updated project version to 2.1.0-SNAPSHOT
  • Upgraded Vaadin framework support to version 25.0.3
  • Added gwt-elemental dependency
  • Refactored internal dependencies for improved maintainability
  • Updated copyright years across project files

[coderabbitai]

Walkthrough

The PR updates the project version to 2.1.0-SNAPSHOT, adds GWT-elemental dependency, upgrades Vaadin from 25.0.0 to 25.0.3, introduces a new OptionsUtils utility class for string blank checks, refactors existing code to use the new utility instead of Apache Commons StringUtils, adds a test AppShellConfiguratorImpl class, and updates copyright years across all files to 2026.

Changes

Cohort / File(s)	Summary
Build Configuration pom.xml	Project version bumped to 2.1.0-SNAPSHOT; Vaadin updated to 25.0.3; GWT-elemental 2.8.2.vaadin2 dependency added; AppShellConfiguratorImpl exclusion added to demo-jar packaging.
String Utility Refactoring src/main/java/com/flowingcode/vaadin/addons/shareeasy/util/CustomDriverOptions.java, src/main/java/com/flowingcode/vaadin/addons/shareeasy/util/Options.java	Replaced org.apache.commons.lang3.StringUtils.isNotBlank() calls with new OptionsUtils.isNotBlank() method; removed StringUtils import dependency.
New Utility Class src/main/java/com/flowingcode/vaadin/addons/shareeasy/util/OptionsUtils.java	Added new package-private utility class with static isNotBlank(String) method for blank string validation.
Test Infrastructure src/test/java/com/flowingcode/vaadin/addons/AppShellConfiguratorImpl.java	New test class implementing Vaadin's AppShellConfigurator with @Theme annotation; serves as default shell configurator for testing.
Source Code Copyright Updates src/main/java/com/flowingcode/vaadin/addons/shareeasy/*.java, src/main/java/com/flowingcode/vaadin/addons/shareeasy/enums/*.java, src/main/java/com/flowingcode/vaadin/addons/shareeasy/util/LanguageKeys.java	Copyright year header updated from 2025 to 2026 (or 2023-2025 to 2023-2026 where applicable); no functional changes.
Test Code Copyright Updates src/test/java/com/flowingcode/vaadin/addons/DemoLayout.java, src/test/java/com/flowingcode/vaadin/addons/shareeasy/*.java, src/test/java/com/flowingcode/vaadin/addons/shareeasy/it/*.java, src/test/java/com/flowingcode/vaadin/addons/shareeasy/test/SerializationTest.java	Copyright year header updated to 2026 across all test classes; no functional changes.
Resource Files src/main/resources/META-INF/VAADIN/package.properties, src/main/resources/META-INF/resources/frontend/src/fc-sharee-connector.js, src/test/resources/META-INF/frontend/styles/share-easy-demo-styles.css	Copyright year header updated to 2026 in properties file, JavaScript connector, and CSS styles; no functional changes.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Suggested reviewers

• javier-godoy

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the main objective of the pull request - adding Vaadin 25 compatibility. It directly reflects the primary intent and is clear and specific.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch issue-21

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No actionable comments were generated in the recent review. 🎉

🧹 Recent nitpick comments

src/test/java/com/flowingcode/vaadin/addons/shareeasy/TrelloDriverOptions.java (1)

32-32: Nit: extra semicolon.

Pre-existing, but there's a stray double semicolon on this line (; ;).

Suggested fix

-    this.setButtonText("Trello"); ;
+    this.setButtonText("Trello");

src/test/java/com/flowingcode/vaadin/addons/AppShellConfiguratorImpl.java (1)

25-28: New AppShellConfigurator implementation for Vaadin 25 demo support looks correct.

Minor nit: Other classes in this project use @SuppressWarnings("serial"). Since AppShellConfigurator extends Serializable, you may want to add it here for consistency, or declare a serialVersionUID.

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