/* ============================================================================
Shared SillyLaird site nav — single source of truth.
Drop this on any sibling site to get the same top nav as www.sillylaird.ca:
The script injects the header markup, pulls in the shared stylesheet, and
then loads site.js (which wires the theme toggle, drawer menu, and language
menu). Edit the markup HERE and every site updates on next load.
If #sl-nav is absent it replaces an existing 
' +
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