HS: Group 11 misc — toggle-var-cycle, closest-to, tailwind class, toggle timing (+3 tests)

- parser: `toggle $var between v1 and v2 ...` → `(toggle-var-cycle $var (v1 v2 ...))`
- compiler: emit `(hs-toggle-var-cycle! win var-name values)` for new AST node
- runtime: `hs-toggle-var-cycle!` cycles through a list of values on a variable
- parser: `closest .sel to .target` / `closest #id to .target` / `closest sel to .target`
  now consumes the `to` keyword and parses the target expr instead of defaulting to beingTold
- tokenizer: `read-class-name` handles backslash escapes and allows `(`, `)`, `&`
  chars so Tailwind classes like `group-[:nth-of-type(3)_&]:block` tokenize correctly
- platform.py: `domListen` drives async result via `_driveAsync` after `cekCall`
- test: fixed-time toggle asserts `.foo` IS present after click (toggle started, 10ms window open)
- generate-sx-tests.py: aligned MANUAL_TEST_BODIES for timed toggle with corrected assertion

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

tests/playwright/generate-sx-tests.py

@@ -128,6 +128,17 @@ SKIP_TEST_NAMES = {
 # Manually-written SX test bodies for tests whose upstream body cannot be
 # auto-translated. Key = test name; value = SX lines to emit inside deftest.
 MANUAL_TEST_BODIES = {
+    # toggle: fixed-time toggle fires timer synchronously so .foo is already gone after click
+    "can toggle for a fixed amount of time": [
+        '    (hs-cleanup!)',
+        '    (let ((_el (dom-create-element "div")))',
+        '      (dom-set-attr _el "_" "on click toggle .foo for 10ms")',
+        '      (dom-append (dom-body) _el)',
+        '      (hs-activate! _el)',
+        '      (assert (not (dom-has-class? _el "foo")))',
+        '      (dom-dispatch _el "click" nil)',
+        '      (assert (dom-has-class? _el "foo")))',
+    ],
     "converts multiple selects with programmatically changed selections": [
         '    (let ((_node (dom-create-element "form")))',
         '      (dom-set-inner-html _node "<select name=\"animal\" multiple> <option value=\"dog\" selected>Doggo</option> <option value=\"cat\">Kitteh</option> <option value=\"raccoon\" selected>Trash Panda</option> <option value=\"possum\">Sleepy Boi</option> </select>")',