fix(painter-dom): restore viewing-mode hover suppression on inline SDTs (SD-3110)

The previous fix added a second chained :not([data-appearance='hidden'])
to the inline lock-hover rule, which bumped its specificity from (0,4,0)
to (0,5,0). The viewing-mode suppression rule below sits at (0,4,0), so
it lost the cascade and the lock-hover blue re-appeared on hover in
viewing mode — regressing the SD-2232 behavior test
"inline SDT hover does not show background in viewing mode".

Collapse the two predicates into a single :not(a, b). Comma-list :not()
takes the max specificity of its arguments, not the sum, so the selector
stays at (0,4,0), viewing-mode suppression wins again, and the
hidden-appearance exclusion is preserved.

Verified: 22/22 SDT behavior cases on chromium, 44/44 on firefox+webkit;
painter-dom unit tests still 1071/1071.

Author: caio-pizzol

packages/layout-engine/painters/dom/src/styles.ts

@@ -667,13 +667,13 @@ const SDT_CONTAINER_STYLES = `
  * Inline SDTs use :hover (single element, no coordination needed).
  * Hover is suppressed when the node is selected (SD-1584).
  *
- * Inline SDTs with appearance=hidden are excluded: this selector has
- * higher specificity than the hidden-appearance rule above (its
- * :not(.ProseMirror-selectednode) adds a class to the specificity tuple),
- * so without the exclusion it would re-introduce the lock-hover blue
- * background on hover and contradict the "visually transparent" intent. */
+ * Inline SDTs with appearance=hidden are excluded via the same :not()
+ * that handles selection. Both predicates live in one :not(a, b) so the
+ * selector keeps (0,4,0) specificity. A second chained :not() would push
+ * it to (0,5,0) and beat the viewing-mode suppression rule below, which
+ * also sits at (0,4,0). */
 .superdoc-structured-content-block[data-lock-mode].sdt-group-hover:not(.ProseMirror-selectednode),
-.superdoc-structured-content-inline[data-lock-mode]:hover:not(.ProseMirror-selectednode):not([data-appearance='hidden']) {
+.superdoc-structured-content-inline[data-lock-mode]:hover:not(.ProseMirror-selectednode, [data-appearance='hidden']) {
   background-color: var(--sd-content-controls-lock-hover-bg, rgba(98, 155, 231, 0.08));
   z-index: 9999999;
 }