Externalize sexp to .sexpr files + render() API

Replace all 676 inline sexp() string calls across 7 services with
render(component_name, **kwargs) calls backed by 46 external .sexpr
component definition files (587 defcomps total).

- Add render() function to shared/sexp/jinja_bridge.py
- Add load_service_components() helper and update load_sexp_dir() for *.sexpr
- Update parser keyword regex to support HTMX hx-on::event syntax
- Convert remaining inline HTML in route files to render() calls
- Add shared/sexp/templates/misc.sexp for cross-service utility components

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

market/bp/fragments/routes.py

@@ -35,7 +35,7 @@ def register():
     async def _container_nav_handler():
         from quart import current_app
         from shared.infrastructure.urls import market_url
-        from shared.sexp.jinja_bridge import sexp as render_sexp
+        from shared.sexp.jinja_bridge import render as render_comp
 
         container_type = request.args.get("container_type", "page")
         container_id = int(request.args.get("container_id", 0))
@@ -51,9 +51,9 @@ def register():
         parts = []
         for m in markets:
             href = market_url(f"/{post_slug}/{m.slug}/")
-            parts.append(render_sexp(
-                '(~market-link-nav :href href :name name :nav-class nav-class)',
-                href=href, name=m.name, **{"nav-class": nav_class},
+            parts.append(render_comp(
+                "market-link-nav",
+                href=href, name=m.name, nav_class=nav_class,
             ))
         return "\n".join(parts)
 
@@ -65,7 +65,7 @@ def register():
         from sqlalchemy import select
         from shared.models.market import Product
         from shared.infrastructure.urls import market_url
-        from shared.sexp.jinja_bridge import sexp as render_sexp
+        from shared.sexp.jinja_bridge import render as render_comp
 
         slug = request.args.get("slug", "")
         keys_raw = request.args.get("keys", "")
@@ -86,8 +86,8 @@ def register():
                         detail = f"<s>{product.regular_price}</s> {product.special_price}"
                     elif product.regular_price:
                         detail = str(product.regular_price)
-                    parts.append(render_sexp(
-                        '(~link-card :title title :image image :subtitle subtitle :detail detail :link link)',
+                    parts.append(render_comp(
+                        "link-card",
                         title=product.title, image=product.image,
                         subtitle=subtitle, detail=detail,
                         link=market_url(f"/product/{product.slug}/"),
@@ -108,8 +108,8 @@ def register():
             detail = f"<s>{product.regular_price}</s> {product.special_price}"
         elif product.regular_price:
             detail = str(product.regular_price)
-        return render_sexp(
-            '(~link-card :title title :image image :subtitle subtitle :detail detail :link link)',
+        return render_comp(
+            "link-card",
             title=product.title, image=product.image,
             subtitle=subtitle, detail=detail,
             link=market_url(f"/product/{product.slug}/"),