HS: route hide through hs-hide! runtime (dialog/details support)

Mirrors hs-show! pattern — dialog calls close(), details sets open=false.
No test count change (custom strategy tests need behavior system).

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

lib/hyperscript/compiler.sx

@@ -926,12 +926,7 @@
                 (let
                   ((tgt (hs-to-sx (nth ast 1)))
                     (strategy (if (> (len ast) 2) (nth ast 2) "display")))
-                  (cond
-                    ((= strategy "opacity")
-                      (list (quote dom-set-style) tgt "opacity" "0"))
-                    ((= strategy "visibility")
-                      (list (quote dom-set-style) tgt "visibility" "hidden"))
-                    (true (list (quote dom-set-style) tgt "display" "none")))))
+                  (list (quote hs-hide!) tgt strategy)))
               ((= head (quote show))
                 (let
                   ((tgt (hs-to-sx (nth ast 1)))