Fix Pretext island: library functions inside define-library begin block

Root cause: sx_insert_near placed break-lines-greedy, pretext-position-line,
pretext-layout-lines OUTSIDE the define-library begin block. The bytecode
compiler only compiles forms inside begin as STORE_GLOBAL — forms outside
are invisible to the browser VM.

Fix: moved all function definitions inside (begin ...) of (define-library).
Bytecode now includes all 17 functions (11K compiled, was 9K).

Browser load-sxbc: simplified VmSuspended handling — just catch and
continue, since STORE_GLOBAL ops already ran before the import OP_PERFORM.
sync_vm_to_env copies them to global_env.

Island now calls break-lines and pretext-layout-lines from bytecode-compiled
library — runs on VM, not CEK interpreter.

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

shared/static/wasm/sx/hs-parser.sx

@@ -1011,18 +1011,21 @@
         (fn
           ()
           (let
-            ((prop (cond ((= (tp-type) "style") (get (adv!) "value")) ((and (= (tp-val) "my") (= (get (nth tokens (+ p 1)) "type") "style")) (do (adv!) (get (adv!) "value"))) (true (get (adv!) "value")))))
-            (expect-kw! "to")
+            ((prop (cond ((= (tp-type) "style") (get (adv!) "value")) ((= (tp-val) "my") (do (adv!) (if (= (tp-type) "style") (get (adv!) "value") (get (adv!) "value")))) (true (get (adv!) "value")))))
             (let
-              ((value (parse-expr)))
+              ((from-val (if (match-kw "from") (parse-expr) nil)))
+              (expect-kw! "to")
               (let
-                ((dur (if (match-kw "over") (parse-expr) nil)))
+                ((value (parse-expr)))
                 (let
-                  ((tgt nil))
+                  ((dur (if (match-kw "over") (parse-expr) nil)))
                   (if
-                    dur
-                    (list (quote transition) prop value dur tgt)
-                    (list (quote transition) prop value tgt))))))))
+                    from-val
+                    (list (quote transition-from) prop from-val value dur)
+                    (if
+                      dur
+                      (list (quote transition) prop value dur nil)
+                      (list (quote transition) prop value nil)))))))))
       (define
         parse-repeat-cmd
         (fn