HS: transition query-ref + multi-prop (+2 tests)

Three parts: (a) parser `collect-transitions` recognises `style`
tokens (`*prop`) as a continuation, so
`transition *width from A to B *height from A to B` chains both
transitions instead of dropping the second. (b) Mock `El` class gets
`nextSibling`/`previousSibling` (plus `*ElementSibling` aliases) so
`transition *W of the next <span/>` can resolve the next-sibling
target via host-get. (c) Generator pattern for
`const X = await evaluate(() => { const el = document.querySelector(SEL);
el.dispatchEvent(new Event(NAME, ...)); return ... })`; optionally
prefixed by a destructuring assignment and allowing trailing
`expect(...).toBe(...)` junk because `_body_statements` only splits on
`;` at depth 0.

Remaining `can use initial to transition to original value` needs
`on click N` count-filtered events (same mock-sync block as cluster 13).

Suite hs-upstream-transition: 13/17 → 15/17. Smoke 0-195: 162/195
unchanged.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -1618,8 +1618,11 @@
                   (if
                     (and
                       (not (at-end?))
-                      (= (tp-type) "ident")
-                      (not (hs-keyword? (tp-val))))
+                      (or
+                        (= (tp-type) "style")
+                        (and
+                          (= (tp-type) "ident")
+                          (not (hs-keyword? (tp-val))))))
                     (collect-transitions
                       (append acc (list (parse-one-transition))))
                     acc)))