handler-source reconstructs defhandler form instead of dumping dict

Builds (defhandler name :path ... :method ... params body) from
the handler dict fields and pretty-prints it with syntax highlighting.

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

sx/sx/data/helpers.sx

@@ -25,14 +25,30 @@
     (name)
     (let
       ((handler-key (str "handler:" name))
-        (val
+        (hdef
           (cek-try
             (fn () (eval-expr (make-symbol handler-key)))
             (fn (err) nil))))
       (if
-        (not (nil? val))
-        (pretty-print val)
-        (str ";;; Handler not found: " name)))))
+        (nil? hdef)
+        (str ";;; Handler not found: " name)
+        (let
+          ((method (or (get hdef "method") "get"))
+            (path (get hdef "path"))
+            (csrf (get hdef "csrf"))
+            (returns (or (get hdef "returns") "element"))
+            (params (or (get hdef "params") (list)))
+            (body (get hdef "body")))
+          (pretty-print
+            (list
+              (make-symbol "defhandler")
+              (make-symbol name)
+              :path path
+              :method (make-keyword method)
+              :csrf csrf
+              :returns returns
+              params
+              body)))))))
 
 (define _spec-dirs (list "spec" "web" "shared/sx/ref" "lib"))