{# ══════════════════════════════════════════════════════════════════════════
   base.html — layout dispatcher (design A/B test)

   Every page template still does {% extends "base.html" %} exactly as before.
   This file no longer holds any markup; it forwards to whichever shell the
   current user has selected:

       jqc_layout == 'layouts/classic.html'  →  the original top-navbar design
       jqc_layout == 'layouts/modern.html'   →  the new sidebar design

   `jqc_layout` is injected by the inject_ui_theme() context processor in
   app/__init__.py, driven by users.ui_theme (see app/routes/ui.py).

   Jinja resolves {% block %} overrides through the whole inheritance chain,
   so child templates need no change at all.
   ══════════════════════════════════════════════════════════════════════════ #}
{% extends jqc_layout %}