[feat]: Rename `<pf-tabs>` to `<pf-v5-tabs>`

[bennypowers]

Summary

Rename <pf-tabs> to <pf-v5-tabs> and update associated CSS custom properties to use the pf-v5 prefix.

Scope

• Rename element tag from pf-tabs to pf-v5-tabs
• Rename all CSS custom properties (e.g. --pf-tabs--* to --pf-v5-tabs--*)
• Update internal class names, imports, and type declarations

Sub-components

Also rename:

• <pf-tab> to <pf-v5-tab>
• <pf-tab-panel> to <pf-v5-tab-panel>

Requirements

• MUST maintain feature parity with the current <pf-tabs> implementation
• MUST rename all public CSS custom properties
• MUST update HTMLElementTagNameMap declarations
• SHOULD provide a codemod or migration guide for downstream consumers