fix: detect Safari version from Version token

[memleakd]

Description

This PR fixes Safari version detection in the UserAgent parser. Safari user agents commonly include both a Version/... token and a Safari/... token:

Version/16.3 Safari/605.1.15

The Safari/... token is not the user-facing Safari browser version. The actual browser version is reported by Version/....

Previously, CodeIgniter identified the browser as Safari but returned the Safari/... value as the version. That could make browser-version checks behave incorrectly, e.g. treating Safari 16.3 as newer than 16.4 because it was reported as 605.1.15.

This keeps Safari detection unchanged, but when Safari is matched it uses the Version/... token for getVersion() if present.

Tests cover desktop Safari, mobile Safari, and Chrome user agents that also contain a Safari/... token.

Fixes #10250

Checklist:

• Securely signed commits
• Component(s) with PHPDoc blocks, only if necessary or adds value (without duplication)
• Unit testing, with >80% coverage
• User guide updated
• Conforms to style guide