Add preview label mode toggle (ID/Name)
Add a UI control and runtime support to toggle preview labels between IDs and localized names. New CSS for the toggle; focus and technology content builders now inject data-preview-label-* and data-preview-title-* attributes and use localized text where available. instanttextbox gained options to control localization/raw rendering. Webview utilities implement subscribe/refresh/apply logic to toggle modes and update displayed text and titles; focustree and techtree wire these up on load and folder changes so the label mode updates without rebuilding content.
