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>

spec/tests/test-hyperscript-behavioral.sx

@@ -12798,6 +12798,7 @@ end")
       (dom-set-attr _el-div "_" "on click transition *width from 0px to 100px *height from 0px to 100px")
       (dom-append (dom-body) _el-div)
       (hs-activate! _el-div)
+      (dom-dispatch _el-div "click" nil)
       (assert= (dom-get-style _el-div "width") "100px")
       (assert= (dom-get-style _el-div "height") "100px")
     ))