Sync the vendored templates/bn/toolbar.templ with the cms copy (entrance
animation, position picker chips, HidePreviewToggle — and the new per-tab
theme tester button). Port themeInitScript to the override-aware
window.bnApplyTheme so jutsu-rendered pages honour the admin's transient
bn-theme-override (sessionStorage) ahead of the visitor bn-theme preference.
Regenerated *_templ.go with templ v0.3.1020 (button/engagement diffs are
generator-version churn only).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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