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>

account/sexp/dashboard.sexpr

@@ -3,15 +3,15 @@
 (defcomp ~account-error-banner (&key error)
   (when error
     (div :class "rounded-lg border border-red-200 bg-red-50 text-red-800 px-4 py-3 text-sm"
-      (raw! error))))
+      error)))
 
 (defcomp ~account-user-email (&key email)
   (when email
-    (p :class "text-sm text-stone-500 mt-1" (raw! email))))
+    (p :class "text-sm text-stone-500 mt-1" email)))
 
 (defcomp ~account-user-name (&key name)
   (when name
-    (p :class "text-sm text-stone-600" (raw! name))))
+    (p :class "text-sm text-stone-600" name)))
 
 (defcomp ~account-logout-form (&key csrf-token)
   (form :action "/auth/logout/" :method "post"
@@ -22,27 +22,27 @@
 
 (defcomp ~account-label-item (&key name)
   (span :class "inline-flex items-center rounded-full border border-stone-200 px-3 py-1 text-xs font-medium bg-white/60"
-    (raw! name)))
+    name))
 
-(defcomp ~account-labels-section (&key items-html)
-  (when items-html
+(defcomp ~account-labels-section (&key items)
+  (when items
     (div
       (h2 :class "text-base font-semibold tracking-tight mb-3" "Labels")
-      (div :class "flex flex-wrap gap-2" (raw! items-html)))))
+      (div :class "flex flex-wrap gap-2" items))))
 
-(defcomp ~account-main-panel (&key error-html email-html name-html logout-html labels-html)
+(defcomp ~account-main-panel (&key error email name logout labels)
   (div :class "w-full max-w-3xl mx-auto px-4 py-6"
     (div :class "bg-white/70 backdrop-blur rounded-2xl shadow border border-stone-200 p-6 sm:p-8 space-y-8"
-      (raw! error-html)
+      error
       (div :class "flex items-center justify-between"
         (div
           (h1 :class "text-xl font-semibold tracking-tight" "Account")
-          (raw! email-html)
-          (raw! name-html))
-        (raw! logout-html))
-      (raw! labels-html))))
+          email
+          name)
+        logout)
+      labels)))
 
 ;; Header child wrapper
-(defcomp ~account-header-child (&key inner-html)
+(defcomp ~account-header-child (&key inner)
   (div :id "root-header-child" :class "flex flex-col w-full items-center"
-    (raw! inner-html)))
+    inner))