Delete last sx_components.py files: relations + test (phase 9)

Move relations component loading into app.py. Move test rendering
functions to test/sxc/pages/__init__.py, update route imports, and
delete both sx_components.py files. Zero sx_components imports remain.

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

test/bp/dashboard/routes.py

@@ -14,7 +14,7 @@ def register(url_prefix: str = "/") -> Blueprint:
         """Full page dashboard with last results."""
         from shared.sx.page import get_template_context
         from shared.browser.app.csrf import generate_csrf_token
-        from sx.sx_components import render_dashboard_page_sx
+        from sxc.pages import render_dashboard_page_sx
         import runner
 
         ctx = await get_template_context()
@@ -63,12 +63,12 @@ def register(url_prefix: str = "/") -> Blueprint:
         if is_htmx:
             # S-expression wire format — sx.js renders client-side
             from shared.sx.helpers import sx_response
-            from sx.sx_components import test_detail_sx
+            from sxc.pages import test_detail_sx
             return sx_response(await test_detail_sx(test))
 
         # Full page render (direct navigation / refresh)
         from shared.sx.page import get_template_context
-        from sx.sx_components import render_test_detail_page_sx
+        from sxc.pages import render_test_detail_page_sx
 
         ctx = await get_template_context()
         html = await render_test_detail_page_sx(ctx, test)
@@ -78,7 +78,7 @@ def register(url_prefix: str = "/") -> Blueprint:
     async def results():
         """HTMX partial — poll target for results table."""
         from shared.browser.app.csrf import generate_csrf_token
-        from sx.sx_components import render_results_partial_sx
+        from sxc.pages import render_results_partial_sx
         import runner
 
         result = runner.get_results()