Delete account/sx/sx_components.py — all rendering now in .sx

Phase 1 of zero-Python rendering: account service.

- Auth pages (login, device, check-email) use _render_auth_page() helper
  calling render_to_sx() + full_page_sx() directly in routes
- Newsletter toggle POST renders inline via render_to_sx()
- Newsletter page helper returns data dict; defpage :data slot fetches,
  :content slot renders via ~account-newsletters-content defcomp
- Fragment page uses (frag ...) IO primitive directly in .sx
- Defpage _eval_slot now uses async_eval_slot_to_sx which expands
  component bodies server-side (executing IO) but serializes tags as SX
- Fix pre-existing OOB ParseError: _eval_slot was producing HTML instead
  of s-expressions for component content slots
- Fix market url_for endpoint: defpage_market_home (app-level, not blueprint)
- Fix events calendar nav: wrap multiple SX parts in fragment

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

shared/sx/async_eval.py

@@ -910,6 +910,42 @@ async def async_eval_to_sx(
     return serialize(result)
 
 
+async def async_eval_slot_to_sx(
+    expr: Any,
+    env: dict[str, Any],
+    ctx: RequestContext | None = None,
+) -> str:
+    """Like async_eval_to_sx but expands component calls.
+
+    Used by defpage slot evaluation where the content expression is
+    typically a component call like ``(~dashboard-content)``.  Normal
+    ``async_eval_to_sx`` serializes component calls without expanding;
+    this variant expands one level so IO primitives in the body execute,
+    then serializes the result as SX wire format.
+    """
+    if ctx is None:
+        ctx = RequestContext()
+    # If expr is a component call, expand it through _aser
+    if isinstance(expr, list) and expr:
+        head = expr[0]
+        if isinstance(head, Symbol) and head.name.startswith("~"):
+            comp = env.get(head.name)
+            if isinstance(comp, Component):
+                result = await _aser_component(comp, expr[1:], env, ctx)
+                if isinstance(result, SxExpr):
+                    return result.source
+                if result is None or result is NIL:
+                    return ""
+                return serialize(result)
+    # Fall back to normal async_eval_to_sx
+    result = await _aser(expr, env, ctx)
+    if isinstance(result, SxExpr):
+        return result.source
+    if result is None or result is NIL:
+        return ""
+    return serialize(result)
+
+
 async def _aser(expr: Any, env: dict[str, Any], ctx: RequestContext) -> Any:
     """Evaluate *expr*, producing SxExpr for rendering forms, raw values
     for everything else."""
@@ -1022,6 +1058,33 @@ async def _aser_fragment(children: list, env: dict, ctx: RequestContext) -> SxEx
     return SxExpr("(<> " + " ".join(parts) + ")")
 
 
+async def _aser_component(
+    comp: Component, args: list, env: dict, ctx: RequestContext,
+) -> Any:
+    """Expand a component body through _aser — produces SX, not HTML."""
+    kwargs: dict[str, Any] = {}
+    children: list[Any] = []
+    i = 0
+    while i < len(args):
+        arg = args[i]
+        if isinstance(arg, Keyword) and i + 1 < len(args):
+            kwargs[arg.name] = await async_eval(args[i + 1], env, ctx)
+            i += 2
+        else:
+            children.append(arg)
+            i += 1
+    local = dict(comp.closure)
+    local.update(env)
+    for p in comp.params:
+        local[p] = kwargs.get(p, NIL)
+    if comp.has_children:
+        child_parts = []
+        for c in children:
+            child_parts.append(serialize(await _aser(c, env, ctx)))
+        local["children"] = SxExpr("(<> " + " ".join(child_parts) + ")")
+    return await _aser(comp.body, local, ctx)
+
+
 async def _aser_call(
     name: str, args: list, env: dict, ctx: RequestContext,
 ) -> SxExpr: