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/tokenizer.sx

@@ -119,6 +119,8 @@
     "empty"
     "clear"
     "swap"
+    "open"
+    "close"
     "exists"
     "matches"
     "contains"