HS trigger: compound event names + detail, event-refs via host-get

- parse-trigger-cmd: use parse-compound-event-name so 'trigger foo:bar' and
  'trigger foo.bar' preserve the full event name. Also parse an optional
  detail dict '(x:42)' like parse-send-cmd.
- compiler: 3-arg (trigger NAME DETAIL TGT) emits dom-dispatch with the
  detail dict. 2-arg (trigger NAME TGT) unchanged.
- emit-on event-ref bindings now use (host-get event 'detail') → the event
  carries detail as a JS object, so the SX 'get' primitive returned nil
  and tests checking 'on foo(x) … x' saw empty values.

Net: trigger 2→6 (100%).

lib/hyperscript/compiler.sx

@@ -162,7 +162,7 @@
                             (let
                               ((raw-compiled (hs-to-sx stripped-body)))
                               (let
-                                ((compiled-body (if (> (len event-refs) 0) (let ((bindings (map (fn (r) (let ((name (nth r 1))) (list (make-symbol name) (list (quote get) (list (quote get) (quote event) "detail") name)))) event-refs))) (list (quote let) bindings raw-compiled)) raw-compiled)))
+                                ((compiled-body (if (> (len event-refs) 0) (let ((bindings (map (fn (r) (let ((name (nth r 1))) (list (make-symbol name) (list (quote host-get) (list (quote host-get) (quote event) "detail") name)))) event-refs))) (list (quote let) bindings raw-compiled)) raw-compiled)))
                                 (let
                                   ((wrapped-body (if catch-info (let ((var (make-symbol (nth catch-info 0))) (catch-body (hs-to-sx (nth catch-info 1)))) (if finally-info (list (quote do) (list (quote guard) (list var (list true catch-body)) compiled-body) (hs-to-sx finally-info)) (list (quote guard) (list var (list true catch-body)) compiled-body))) (if finally-info (list (quote do) compiled-body (hs-to-sx finally-info)) compiled-body)))
                                     (handler
@@ -1468,11 +1468,20 @@
                 (list (quote console-log) (hs-to-sx (nth ast 1))))
               ((= head (quote send)) (emit-send ast))
               ((= head (quote trigger))
-                (list
-                  (quote dom-dispatch)
-                  (hs-to-sx (nth ast 2))
-                  (nth ast 1)
-                  nil))
+                (let
+                  ((name (nth ast 1))
+                    (has-detail
+                      (and
+                        (= (len ast) 4)
+                        (list? (nth ast 2))
+                        (= (first (nth ast 2)) (quote dict))))
+                    (tgt (if (= (len ast) 4) (nth ast 3) (nth ast 2)))
+                    (detail (if (= (len ast) 4) (nth ast 2) nil)))
+                  (list
+                    (quote dom-dispatch)
+                    (hs-to-sx tgt)
+                    name
+                    (if has-detail (hs-to-sx detail) nil))))
               ((= head (quote hide))
                 (let
                   ((tgt (let ((raw-tgt (nth ast 1))) (if (and (list? raw-tgt) (= (first raw-tgt) (quote query))) (list (quote hs-query-all) (nth raw-tgt 1)) (hs-to-sx raw-tgt))))

lib/hyperscript/parser.sx

@@ -1438,10 +1438,15 @@
         (fn
           ()
           (let
-            ((name (get (adv!) "value")))
+            ((name (parse-compound-event-name)))
             (let
-              ((tgt (parse-tgt-kw "on" (list (quote me)))))
-              (list (quote trigger) name tgt)))))
+              ((dtl (if (= (tp-type) "paren-open") (parse-detail-dict) nil)))
+              (let
+                ((tgt (parse-tgt-kw "on" (list (quote me)))))
+                (if
+                  dtl
+                  (list (quote trigger) name dtl tgt)
+                  (list (quote trigger) name tgt)))))))
       (define parse-log-cmd (fn () (list (quote log) (parse-expr))))
       (define
         parse-inc-cmd