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>

shared/sx/jinja_bridge.py

@@ -6,7 +6,7 @@ can coexist during incremental migration:
 
 **Jinja → s-expression** (use s-expression components inside Jinja templates)::
 
-    {{ sx('(~link-card :slug "apple" :title "Apple")') | safe }}
+    {{ sx('(~shared:fragments/link-card :slug "apple" :title "Apple")') | safe }}
 
 **S-expression → Jinja** (embed Jinja output inside s-expressions)::
 
@@ -220,7 +220,7 @@ def register_components(sx_source: str) -> None:
     Typically called at app startup::
 
         register_components('''
-            (defcomp ~link-card (&key link title image icon)
+            (defcomp ~shared:fragments/link-card (&key link title image icon)
               (a :href link :class "block rounded ..."
                 (div :class "flex ..."
                   (if image
@@ -269,7 +269,7 @@ def sx(source: str, **kwargs: Any) -> str:
     Keyword arguments are merged into the evaluation environment,
     so Jinja context variables can be passed through::
 
-        {{ sx('(~link-card :title title :slug slug)',
+        {{ sx('(~shared:fragments/link-card :title title :slug slug)',
                 title=post.title, slug=post.slug) | safe }}
 
     This is a synchronous function — suitable for Jinja globals.