feat: Dart SDK update for version 19.2.1

[abnegate]

This PR contains updates to the Dart SDK for version 19.2.1.

Summary by CodeRabbit

• New Features

  • Added transaction support for Databases and TablesDB.

• Documentation

  • Updated README install instructions to use version 19.2.1.
  • Updated changelog with details for version 19.2.1.

• Chores

  • Bumped SDK version to 19.2.1 across the project.
  • Updated SDK version metadata/headers to reflect the new release.

[coderabbitai]

Walkthrough

This PR bumps the SDK from 19.2.0 to 19.2.1 across the project. It updates version strings in pubspec.yaml, README.md, and CHANGELOG.md (adding a bullet about transaction support for Databases and TablesDB). It also updates the x-sdk-version header in lib/src/client_browser.dart and both x-sdk-version and User-Agent in lib/src/client_io.dart. No exported/public APIs or logic are changed.

Possibly related PRs

• feat: Dart SDK update for version 19.1.0 #93: Also updates SDK version metadata in lib/src/client_browser.dart and lib/src/client_io.dart.

Suggested reviewers

• abnegate

Pre-merge checks and finishing touches

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The title concisely communicates the bump of the Dart SDK to version 19.2.1, which is the primary change across documentation and client code; it directly relates to the version update performed in this PR without being misleading or overly generic.
Docstring Coverage	✅ Passed	No functions found in the changes. Docstring coverage check skipped.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch dev

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 6279a1c and 567febd.

📒 Files selected for processing (5)

• CHANGELOG.md (1 hunks)
• README.md (1 hunks)
• lib/src/client_browser.dart (1 hunks)
• lib/src/client_io.dart (1 hunks)
• pubspec.yaml (1 hunks)

🔇 Additional comments (5)

lib/src/client_browser.dart (1)

33-33: LGTM! Version header updated correctly.

The x-sdk-version header has been consistently updated to reflect version 19.2.1.

CHANGELOG.md (1)

3-5: LGTM! Changelog updated for version 19.2.1.

The version header and feature bullet are properly formatted and document the new release.

lib/src/client_io.dart (1)

39-41: LGTM! Version metadata updated correctly.

Both the x-sdk-version header and User-Agent string have been consistently updated to version 19.2.1.

pubspec.yaml (1)

2-2: LGTM! Package version updated correctly.

The package version has been properly bumped to 19.2.1, following semantic versioning conventions.

README.md (1)

26-26: LGTM! Documentation updated to reflect new version.

The installation example correctly references version 19.2.1, consistent with the package version in pubspec.yaml.

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