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>

cart/sx/handlers/account-nav-item.sx

@@ -4,6 +4,6 @@
 ;; Renders the "orders" link for the account dashboard nav.
 
 (defhandler account-nav-item (&key)
-  (~account-nav-item
+  (~shared:fragments/account-nav-item
     :href (app-url "cart" "/orders/")
     :label "orders"))

cart/sx/handlers/cart-mini.sx

@@ -10,7 +10,7 @@
         (count (+ (or (get summary "count") 0)
                   (or (get summary "calendar_count") 0)
                   (or (get summary "ticket_count") 0))))
-    (~cart-mini
+    (~shared:fragments/cart-mini
       :cart-count count
       :blog-url (app-url "blog" "")
       :cart-url (app-url "cart" "")