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>

federation/sx/handlers/link-card.sx

@@ -12,7 +12,7 @@
         (let ((actor (service "federation" "get-actor-by-username" :username u)))
           (<> (str "<!-- fragment:" u " -->")
               (when (not (nil? actor))
-                (~link-card
+                (~shared:fragments/link-card
                   :link (app-url "federation"
                           (str "/users/" (get actor "preferred_username")))
                   :title (or (get actor "display_name")
@@ -28,7 +28,7 @@
         (let ((actor (service "federation" "get-actor-by-username"
                        :username lookup)))
           (when (not (nil? actor))
-            (~link-card
+            (~shared:fragments/link-card
               :link (app-url "federation"
                       (str "/users/" (get actor "preferred_username")))
               :title (or (get actor "display_name")