docs: add deprecation metadata

[javier-godoy]

Summary by CodeRabbit

• Chores
  • Updated deprecation notices for several legacy APIs to indicate they are scheduled for removal in future releases.
  • No runtime behavior or user-facing functionality was changed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: db4cd298-45e3-4fa6-9df3-2f50cef73e31

📥 Commits

Reviewing files that changed from the base of the PR and between 9515ad3 and 18e2413.

📒 Files selected for processing (2)

• base/src/main/java/com/flowingcode/vaadin/addons/demo/EnhancedRouteTabs.java
• base/src/main/java/com/flowingcode/vaadin/addons/demo/TabbedDemo.java

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Walkthrough

The PR updates deprecation annotations on three demo methods to include forRemoval = true and version metadata. No method logic or signatures changed.

Changes

Demo deprecation annotations

Layer / File(s)	Summary
Legacy tab deprecation metadata base/src/main/java/com/flowingcode/vaadin/addons/demo/EnhancedRouteTabs.java	addLegacyTab(String, Component) now uses @Deprecated(forRemoval = true, since = "4.1.0").
Theme attribute deprecation metadata base/src/main/java/com/flowingcode/vaadin/addons/demo/TabbedDemo.java	getThemeAttribute() and applyThemeAttribute(Element, String) now use @Deprecated(forRemoval = true, since = "5.2.0").

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related PRs

• FlowingCode/CommonsDemo#127: Updates the same TabbedDemo theme-attribute methods with related deprecation metadata changes.

Suggested reviewers

• mlopezFC
• paodb

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ 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 clearly matches the main change: adding deprecation metadata to existing deprecated methods.
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 deprecation-metadata

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[sonarqubecloud]

Quality Gate failed

Failed conditions
D Maintainability Rating on New Code (required ≥ A)

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