HS: open/close commands for dialog/details — 428→435

- Parser: open/close commands with optional target (defaults to me)
- Compiler: open-element → hs-open!, close-element → hs-close!
- Runtime: hs-open! calls showModal() for dialogs, sets open=true for details
- Runtime: hs-close! calls close() for dialogs, sets open=false for details
- dialog: 1/10 → 8/10

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

lib/hyperscript/compiler.sx

@@ -827,6 +827,10 @@
                 (list (quote dom-remove) (hs-to-sx (nth ast 1))))
               ((= head (quote empty-target))
                 (list (quote hs-empty-target!) (hs-to-sx (nth ast 1))))
+              ((= head (quote open-element))
+                (list (quote hs-open!) (hs-to-sx (nth ast 1))))
+              ((= head (quote close-element))
+                (list (quote hs-close!) (hs-to-sx (nth ast 1))))
               ((= head (quote swap!))
                 (let
                   ((lhs (nth ast 1)) (rhs (nth ast 2)))