Rename all 1,169 components to path-based names with namespace support

Component names now reflect filesystem location using / as path separator
and : as namespace separator for shared components:
  ~sx-header → ~layouts/header
  ~layout-app-body → ~shared:layout/app-body
  ~blog-admin-dashboard → ~admin/dashboard

209 files, 4,941 replacements across all services.

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

sx/sx/not-found.sx

@@ -1,6 +1,6 @@
 ;; 404 Not Found page content
 
-(defcomp ~not-found-content (&key (path :as string?))
+(defcomp ~not-found/content (&key (path :as string?))
   (div :class "max-w-3xl mx-auto px-4 py-12 text-center"
     (h1 :style (cssx (:text (colour "stone" 800) (size "3xl") (weight "bold")))
       "404")