Update reference SX spec to match sx.js macros branch (CSSX, dict literals, new primitives)

- eval.sx: Add defstyle, defkeyframes, defhandler special forms; add ho-for-each
- parser.sx: Add dict {...} literal parsing and quasiquote/unquote sugar
- primitives.sx: Add parse-datetime, split-ids, css, merge-styles primitives
- render.sx: Add StyleValue handling, SVG filter elements, definition forms in render, fix render-to-html to handle HTML tags directly
- bootstrap_js.py: Add StyleValue type, buildKeyframes, isEvery platform helper, new primitives (format-date, parse-datetime, split-ids, css, merge-styles), dict/quasiquote parser, expose render functions as primitives
- sx-ref.js: Regenerated — 132/132 tests passing

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

shared/sx/ref/eval.sx

@@ -96,7 +96,7 @@
 
       ;; --- dict literal ---
       "dict"
-        (map-dict (fn (k v) (list k (trampoline (eval-expr v env)))) expr)
+        (map-dict (fn (k v) (trampoline (eval-expr v env))) expr)
 
       ;; --- list = call or special form ---
       "list"
@@ -141,6 +141,9 @@
               (= name "define")      (sf-define args env)
               (= name "defcomp")     (sf-defcomp args env)
               (= name "defmacro")    (sf-defmacro args env)
+              (= name "defstyle")    (sf-defstyle args env)
+              (= name "defkeyframes") (sf-defkeyframes args env)
+              (= name "defhandler")  (sf-define args env)
               (= name "begin")       (sf-begin args env)
               (= name "do")          (sf-begin args env)
               (= name "quote")       (sf-quote args env)
@@ -495,6 +498,25 @@
       (list params rest-param))))
 
 
+(define sf-defstyle
+  (fn (args env)
+    ;; (defstyle name expr) — bind name to evaluated expr (typically a StyleValue)
+    (let ((name-sym (first args))
+          (value    (trampoline (eval-expr (nth args 1) env))))
+      (env-set! env (symbol-name name-sym) value)
+      value)))
+
+
+(define sf-defkeyframes
+  (fn (args env)
+    ;; (defkeyframes name (selector body) ...) — build @keyframes rule,
+    ;; register in keyframes dict, return StyleValue.
+    ;; Delegates to platform: build-keyframes returns a StyleValue.
+    (let ((kf-name (symbol-name (first args)))
+          (steps   (rest args)))
+      (build-keyframes kf-name steps env))))
+
+
 (define sf-begin
   (fn (args env)
     (if (empty? args)
@@ -651,6 +673,15 @@
         coll))))
 
 
+(define ho-for-each
+  (fn (args env)
+    (let ((f    (trampoline (eval-expr (first args) env)))
+          (coll (trampoline (eval-expr (nth args 1) env))))
+      (for-each
+        (fn (item) (trampoline (call-lambda f (list item) env)))
+        coll))))
+
+
 ;; --------------------------------------------------------------------------
 ;; 8. Primitives — pure functions available in all targets
 ;; --------------------------------------------------------------------------
@@ -728,4 +759,7 @@
 ;;   (strip-prefix s prefix)  → string with prefix removed (or s unchanged)
 ;;   (apply f args)           → call f with args list
 ;;   (zip lists...)           → list of tuples
+;;
+;; CSSX (style system):
+;;   (build-keyframes name steps env) → StyleValue (platform builds @keyframes)
 ;; --------------------------------------------------------------------------