HS: generator hand-rolls + transition possessive target (+4 tests)

Parser: add 'the ...' as a recognized transition target in parse-transition-cmd's
tgt cond, enabling 'transition the next <div/>'s *width from A to B'.

Generator MANUAL_TEST_BODIES for 4 previously-SKIP tests:
- can transition on query ref with possessive (transition suite, 17/17)
- can write to next element with put command (relativePositionalExpression, 23/23)
- parse error at EOF on trailing newline does not crash (core/parser, 13/14)
- halt works outside of event context (halt suite, 7/7)

Also fix hs-kernel-eval.js navigator assignment for Node.js v22 (read-only global).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -1818,7 +1818,7 @@
         (fn
           ()
           (let
-            ((tgt (cond ((and (= (tp-type) "ident") (= (tp-val) "element")) (do (adv!) (parse-atom))) ((and (= (tp-type) "keyword") (= (tp-val) "its")) (do (adv!) (list (quote ref) "it"))) ((= (tp-type) "id") (parse-atom)) ((= (tp-type) "class") (parse-atom)) ((= (tp-type) "selector") (parse-atom)) (true nil))))
+            ((tgt (cond ((and (= (tp-type) "ident") (= (tp-val) "element")) (do (adv!) (parse-atom))) ((and (= (tp-type) "keyword") (= (tp-val) "its")) (do (adv!) (list (quote ref) "it"))) ((= (tp-type) "id") (parse-atom)) ((= (tp-type) "class") (parse-atom)) ((= (tp-type) "selector") (parse-atom)) ((= (tp-val) "the") (parse-atom)) (true nil))))
             (define
               parse-one-transition
               (fn