Remove badgeComponent experimental flag requirement

[paodb]

The Badge component is stable and non-experimental as of Vaadin 25.2, so the badgeComponent feature flag is no longer needed to use this add-on.

• Delete src/main/resources/vaadin-featureflags.properties
• Upgrade vaadin.version to 25.2.1
• Drop the now-orphan vaadin-featureflags.properties jar exclusion
• Bump add-on version to 2.1.0-SNAPSHOT
• Update README supported versions and remove the flag-enabling section

Close #49

Summary by CodeRabbit

• Documentation

  • Clarified supported Vaadin version compatibility with explicit mappings for add-on versions 2.0 and 2.1.
  • Removed outdated setup guidance for the badge component.

• Chores

  • Updated the add-on to the 2.1.0 release line and aligned it with a newer Vaadin platform version.

[coderabbitai]

Walkthrough

Bumps project version to 2.1.0-SNAPSHOT and Vaadin dependency to 25.2.1, removes the experimental badge component feature flag property, updates the maven-jar-plugin exclusion list accordingly, and revises README to document version mappings and drop the badge-enablement instructions.

Changes

Badge component no longer experimental

Layer / File(s)	Summary
Version bump and feature flag removal pom.xml, src/main/resources/vaadin-featureflags.properties	Project version raised to 2.1.0-SNAPSHOT, Vaadin BOM bumped to 25.2.1, the badge component experimental flag entry removed, and jar-plugin exclusions updated to exclude flow-build-info.json instead of the feature flags file.
README version and guide updates README.md	Compatibility section now explicitly maps Vaadin 25.1 to add-on 2.0 and Vaadin 25.2+ to add-on 2.1; the "Enabling the Badge component" section is removed from the Developer Guide.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Possibly related PRs

• FlowingCode/BadgeList#40: Original PR that added the experimental badge feature flag now being removed here.
• FlowingCode/BadgeList#45: Overlaps with removal of the feature flag and related README documentation changes.

Suggested reviewers: scardanzan, javier-godoy

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR removes the feature flag file, upgrades Vaadin to 25.2.1, and updates docs, matching #49's request to drop the experimental flag requirement.
Out of Scope Changes check	✅ Passed	The version bump and README updates support the same flag-removal change and do not introduce unrelated scope.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and accurately summarizes the main change: removing the badgeComponent experimental flag requirement.

✨ 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 issue-49

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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