Send all responses as sexp wire format with client-side rendering

- Server sends sexp source text, client (sexp.js) renders everything
- SexpExpr marker class for nested sexp composition in serialize()
- sexp_page() HTML shell with data-mount="body" for full page loads
- sexp_response() returns text/sexp for OOB/partial responses
- ~app-body layout component replaces ~app-layout (no raw!)
- ~rich-text is the only component using raw! (for CMS HTML content)
- Fragment endpoints return text/sexp, auto-wrapped in SexpExpr
- All _*_html() helpers converted to _*_sexp() returning sexp source
- Head auto-hoist: sexp.js moves meta/title/link/script[ld+json]
  from rendered body to document.head automatically
- Unknown components render warning box instead of crashing page
- Component kwargs preserve AST for lazy rendering (fixes <> in kwargs)
- Fix unterminated paren in events/sexp/tickets.sexpr

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

events/bp/day/admin/routes.py

@@ -6,6 +6,7 @@ from quart import (
 
 
 from shared.browser.app.authz import require_admin
+from shared.sexp.helpers import sexp_response
 
 
 def register():
@@ -23,8 +24,8 @@ def register():
         tctx = await get_template_context()
         if not is_htmx_request():
             html = await render_day_admin_page(tctx)
+            return await make_response(html)
         else:
-            html = await render_day_admin_oob(tctx)
-
-        return await make_response(html)
+            sexp_src = await render_day_admin_oob(tctx)
+            return sexp_response(sexp_src)
     return bp

events/bp/day/routes.py

@@ -18,6 +18,7 @@ from models.calendars import CalendarSlot  # add this import
 from sqlalchemy import select
 
 from shared.browser.app.utils.htmx import is_htmx_request
+from shared.sexp.helpers import sexp_response
 
 
 def register():
@@ -79,12 +80,12 @@ def register():
         day_slots = list(result.scalars())
 
         # Fetch container nav from relations (exclude calendar — we're on a calendar page)
-        container_nav_html = ""
+        container_nav = ""
         post_data = getattr(g, "post_data", None)
         if post_data:
             post_id = post_data["post"]["id"]
             post_slug = post_data["post"]["slug"]
-            container_nav_html = await fetch_fragment("relations", "container-nav", params={
+            container_nav = await fetch_fragment("relations", "container-nav", params={
                 "container_type": "page",
                 "container_id": str(post_id),
                 "post_slug": post_slug,
@@ -101,7 +102,7 @@ def register():
             "user_entries": visible.user_entries,
             "confirmed_entries": visible.confirmed_entries,
             "day_slots": day_slots,
-            "container_nav_html": container_nav_html,
+            "container_nav": container_nav,
         }
 
 
@@ -127,9 +128,10 @@ def register():
         tctx = await get_template_context()
         if not is_htmx_request():
             html = await render_day_page(tctx)
+            return await make_response(html)
         else:
-            html = await render_day_oob(tctx)
-        return await make_response(html)
+            sexp_src = await render_day_oob(tctx)
+            return sexp_response(sexp_src)
 
     @bp.get("/w/<widget_domain>/")
     async def widget_paginate(widget_domain: str, **kwargs):