Delete 391 dead Jinja templates replaced by sx_components/defpage

All app-level templates have been replaced by native sx component builders
and defpage declarative routes. Removes ~15,200 lines of dead HTML.

Kept: shared/browser templates (errors, ap_social, macros, root layout),
account + federation _email/magic_link, federation profile.html chain.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/browser/templates/macros/cart_icon.html

@@ -1,31 +0,0 @@
-{# Cart icon/badge — shows logo when empty, cart icon with count when items present #}
-
-{% macro cart_icon(count=0, oob=False) %}
-<div id="cart-mini" {% if oob %}sx-swap-oob="{{oob}}"{% endif %}>
-  {% if count == 0 %}
-  <div class="h-12 w-12 rounded-full overflow-hidden border border-stone-300 flex-shrink-0">
-    <a
-      href="{{ blog_url('/') }}"
-      class="h-full w-full font-bold text-5xl flex-shrink-0 flex flex-row items-center gap-1"
-    >
-      <img
-        src="{{ site().logo }}"
-        class="h-full w-full rounded-full object-cover border border-stone-300 flex-shrink-0"
-      >
-    </a>
-  </div>
-  {% else %}
-    <a
-      href="{{ cart_url('/') }}"
-      class="relative inline-flex items-center justify-center text-stone-700 hover:text-emerald-700"
-    >
-      <i class="fa fa-shopping-cart text-5xl" aria-hidden="true"></i>
-      <span
-        class="absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 inline-flex items-center justify-center rounded-full bg-emerald-600 text-white text-sm w-5 h-5"
-      >
-        {{ count }}
-      </span>
-    </a>
-  {% endif %}
-</div>
-{% endmacro %}