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>

account/sexp/dashboard.sexpr

@@ -0,0 +1,48 @@
+;; Account dashboard components
+
+(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))))
+
+(defcomp ~account-user-email (&key email)
+  (when email
+    (p :class "text-sm text-stone-500 mt-1" (raw! email))))
+
+(defcomp ~account-user-name (&key name)
+  (when name
+    (p :class "text-sm text-stone-600" (raw! name))))
+
+(defcomp ~account-logout-form (&key csrf-token)
+  (form :action "/auth/logout/" :method "post"
+    (input :type "hidden" :name "csrf_token" :value csrf-token)
+    (button :type "submit"
+      :class "inline-flex items-center gap-2 rounded-full border border-stone-300 px-4 py-2 text-sm font-medium text-stone-700 hover:bg-stone-50 transition"
+      (i :class "fa-solid fa-right-from-bracket text-xs") " Sign out")))
+
+(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)))
+
+(defcomp ~account-labels-section (&key items-html)
+  (when items-html
+    (div
+      (h2 :class "text-base font-semibold tracking-tight mb-3" "Labels")
+      (div :class "flex flex-wrap gap-2" (raw! items-html)))))
+
+(defcomp ~account-main-panel (&key error-html email-html name-html logout-html labels-html)
+  (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)
+      (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))))
+
+;; Header child wrapper
+(defcomp ~account-header-child (&key inner-html)
+  (div :id "root-header-child" :class "flex flex-col w-full items-center"
+    (raw! inner-html)))