sx-http: fix serialize_value + include all defines in component-defs

serialize_value: all lists emit (items...) not (list items...), matching
Python serialize() exactly. Empty lists emit (). This fixes let bindings,
fn params, and data structures for client-side parsing.

Component-defs now include named lambdas, macros, dicts, and other named
values from the env — client needs CSSX functions (cssx-process-token,
cssx-colour-props, cssx-spacing-props etc.) for island hydration.

Fixes: cssx-process-token, cssx-colour-props undefined errors.
Geography page: fully rendered with header island hydration working.
Homepage: nav renders, no error banners, stepper silent.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

hosts/ocaml/bin/sx_server.ml

@@ -53,14 +53,10 @@ let rec serialize_value = function
   | Symbol s -> s
   | Keyword k -> ":" ^ k
   | List items | ListRef { contents = items } ->
-    (* Lists with a symbol head are call expressions: (fn arg1 arg2).
-       Lists starting with data values are data: (list 1 2 3).
-       This distinction matters for the client parser. *)
-    (match items with
-     | (Symbol _ | Keyword _) :: _ ->
-       "(" ^ String.concat " " (List.map serialize_value items) ^ ")"
-     | _ ->
-       "(list " ^ String.concat " " (List.map serialize_value items) ^ ")")
+    (* All lists: (items...) — no (list ...) wrapper.
+       Matches Python serialize() exactly. The SX source code itself uses
+       (list ...) where data lists are needed; the serializer preserves AST. *)
+    "(" ^ String.concat " " (List.map serialize_value items) ^ ")"
   | Dict d ->
     let pairs = Hashtbl.fold (fun k v acc ->
       (Printf.sprintf ":%s %s" k (serialize_value v)) :: acc) d [] in
@@ -1635,7 +1631,8 @@ let read_css_file path =
 let http_inject_shell_statics env static_dir sx_sxc =
   (* Component definitions for client *)
   let buf = Buffer.create 65536 in
-  Hashtbl.iter (fun _sym v ->
+  Hashtbl.iter (fun sym v ->
+    let name = Sx_types.unintern sym in
     match v with
     | Component c ->
       let ps = String.concat " " (
@@ -1649,6 +1646,22 @@ let http_inject_shell_statics env static_dir sx_sxc =
         (if i.i_has_children then ["&rest"; "children"] else [])) in
       Buffer.add_string buf (Printf.sprintf "(defisland ~%s (%s) %s)\n"
         i.i_name ps (serialize_value i.i_body))
+    | Lambda l when l.l_name <> None ->
+      (* Named lambdas — client needs utility functions like cssx-process-token *)
+      let fn_name = match l.l_name with Some n -> n | None -> name in
+      let ps = String.concat " " l.l_params in
+      Buffer.add_string buf (Printf.sprintf "(define %s (fn (%s) %s))\n"
+        fn_name ps (serialize_value l.l_body))
+    | Macro m ->
+      let ps = String.concat " " m.m_params in
+      let mname = match m.m_name with Some n -> n | None -> name in
+      Buffer.add_string buf (Printf.sprintf "(defmacro %s (%s) %s)\n"
+        mname ps (serialize_value m.m_body))
+    | Dict _ | Number _ | String _ | Bool _ | List _ | ListRef _ ->
+      (* Named values (dicts, lists, constants) — client needs CSSX config etc. *)
+      if String.length name > 0 && name.[0] <> '_' && name.[0] <> '*' then
+        Buffer.add_string buf (Printf.sprintf "(define %s %s)\n"
+          name (serialize_value v))
     | _ -> ()
   ) env.bindings;
   let raw_defs = Buffer.contents buf in