fix(sw): preserve theme token inheritance across viewer components

packages/sw/src/theme/sw-viewer.css

@@ -1,9 +1,9 @@
 /* @hm-design/sw — SW viewer mode (reference: DWG/DXF viewer top menu and floating panels, measured 2026-10-19).
    Viewer-only tokens. The three header surfaces reuse the user-confirmed SW tokens of sw.css
-   (--hm-sw-header-document-* / object-* / property-*). Never touches global selectors or the SWHeader. */
+   (--hm-sw-header-document-* / object-* / property-*). Never touches global selectors or the SWHeader.
+   Declared on the outermost SW scope only, like sw.css: nested viewer menus / panels inherit the tokens. */
 
-.hm-sw-header,
-.hm-sw-theme {
+:is(.hm-sw-header, .hm-sw-theme):not(:where(.hm-sw-header, .hm-sw-theme) *) {
   /* Header */
   --hm-sw-viewer-height: 52px;
   --hm-sw-viewer-background: linear-gradient(180deg, #266651 0%, #123328 45%, #0a221d 100%);