Delete orders + federation sx_components.py — rendering inlined to routes

Phase 2 (Orders):
- Checkout error/return renders moved directly into route handlers
- Removed orphaned test_sx_helpers.py

Phase 3 (Federation):
- Auth pages use _render_social_auth_page() helper in routes
- Choose-username render inlined into identity routes
- Timeline/search/follow/interaction renders inlined into social routes
  using serializers imported from sxc.pages
- Added _social_page() to sxc/pages/__init__.py for shared use
- Home page renders inline in app.py

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

federation/bp/identity/routes.py

@@ -26,6 +26,33 @@ RESERVED = frozenset({
 })
 
 
+async def _render_choose_username(*, actor=None, error="", username=""):
+    """Render choose-username page — replaces sx_components helper."""
+    from shared.browser.app.csrf import generate_csrf_token
+    from shared.config import config
+    from shared.sx.helpers import render_to_sx
+    from shared.sx.parser import SxExpr
+    from shared.sx.page import get_template_context
+    from sxc.pages import _social_page
+    from markupsafe import escape
+
+    ctx = await get_template_context()
+    csrf = generate_csrf_token()
+    ap_domain = config().get("ap_domain", "rose-ash.com")
+    check_url = url_for("identity.check_username")
+
+    error_sx = await render_to_sx("auth-error-banner", error=error) if error else ""
+    content = await render_to_sx(
+        "federation-choose-username",
+        domain=str(escape(ap_domain)),
+        error=SxExpr(error_sx) if error_sx else None,
+        csrf=csrf, username=str(escape(username)),
+        check_url=check_url,
+    )
+    return await _social_page(ctx, actor, content=content,
+                        title="Choose Username \u2014 Rose Ash")
+
+
 def register(url_prefix="/identity"):
     bp = Blueprint("identity", __name__, url_prefix=url_prefix)
 
@@ -39,11 +66,7 @@ def register(url_prefix="/identity"):
         if actor:
             return redirect(url_for("activitypub.actor_profile", username=actor.preferred_username))
 
-        from shared.sx.page import get_template_context
-        from sx.sx_components import render_choose_username_page
-        ctx = await get_template_context()
-        ctx["actor"] = actor
-        return await render_choose_username_page(ctx)
+        return await _render_choose_username(actor=actor)
 
     @bp.post("/choose-username")
     async def choose_username():
@@ -71,11 +94,7 @@ def register(url_prefix="/identity"):
             error = "This username is already taken."
 
         if error:
-            from shared.sx.page import get_template_context
-            from sx.sx_components import render_choose_username_page
-            ctx = await get_template_context(error=error, username=username)
-            ctx["actor"] = None
-            return await render_choose_username_page(ctx), 400
+            return await _render_choose_username(error=error, username=username), 400
 
         # Create ActorProfile with RSA keys
         display_name = g.user.name or username