fix(docs-ui): remove light logo tile in dark mode

Site logo is a normal dark-bar icon control; only override the theme’s SVG
filter. Bump override URL (?v=2) to shed cached light-button rules.

Made-with: Cursor

Author: AMDphreak

site/supplemental-ui/css/site-doc-layout.css

@@ -188,8 +188,8 @@ pre,
   flex-shrink: 0;
 }
 
-/* Dark-mode FTN header logo: see css/site-header-logo-override.css (logo link background +
-   no filter on the img; separate file to reduce stale cache). */
+/* Dark-mode FTN header logo: see css/site-header-logo-override.css (strip theme filter on the
+   SVG only; same transparent bar as other .adt-header-icon-btn; file separate for cache). */
 
 a.adt-header-title,
 .navbar-item.adt-header-title {

site/supplemental-ui/css/site-header-logo-override.css

@@ -1,27 +1,7 @@
-/* Load after site-doc-layout (head-meta). Markup: navbar-item adt-header-icon-btn adt-header-site-logo
-   (same as other top bar icon buttons) + adt-header-site-logo for per-site / per-logo overrides. */
-/* Dark: light “button” fill so the full control matches the other top bar hit targets. */
-html.dark-theme .header.adt-header .navbar .navbar-item.adt-header-icon-btn.adt-header-site-logo,
-html.dark-theme .header.adt-header .navbar a.adt-header-icon-btn.adt-header-site-logo {
-  background: #eef0f3 !important;
-  background-color: #eef0f3 !important;
-  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.1) !important;
-}
-
-html.dark-theme .header.adt-header .navbar .adt-header-icon-btn.adt-header-site-logo:hover {
-  background: #dde1e6 !important;
-  background-color: #dde1e6 !important;
-  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.12) !important;
-}
-
-/* site-doc-layout uses :focus { background: transparent } on all icon btn — re-apply the tile for the site logo. */
-html.dark-theme .header.adt-header .navbar .adt-header-icon-btn.adt-header-site-logo:focus,
-html.dark-theme .header.adt-header .navbar .adt-header-icon-btn.adt-header-site-logo:focus-visible {
-  background: #eef0f3 !important;
-  background-color: #eef0f3 !important;
-}
-
-/* antora-dark-theme: do not recolor the SVG */
+/* Load after site-doc-layout (head-meta). Markup: navbar-item adt-header-icon-btn
+   adt-header-site-logo — same as other top bar icon buttons. Optional hook: .adt-header-site-logo. */
+/* In dark mode the logo button uses the same transparent bar as GitHub / theme (no light tile). */
+/* antora-dark-theme ships filter on .adt-header-logo; keep the real SVG colors. */
 html.dark-theme .adt-header-site-logo .adt-header-logo,
 html.dark-theme .adt-header-icon-btn.adt-header-site-logo .adt-header-logo,
 html.dark-theme .adt-header-icon-btn.adt-header-site-logo > img {

site/supplemental-ui/partials/head-meta.hbs

@@ -3,7 +3,7 @@
 <link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Source+Sans+3:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap">
 <link rel="stylesheet" href="{{{uiRootPath}}}/css/site-extra.css">
 <link rel="stylesheet" href="{{{uiRootPath}}}/css/site-doc-layout.css">
-<link rel="stylesheet" href="{{{uiRootPath}}}/css/site-header-logo-override.css">
+<link rel="stylesheet" href="{{{uiRootPath}}}/css/site-header-logo-override.css?v=2">
 {{#if page.origin.webUrl}}
 <meta name="antora-repo-url" content="{{page.origin.webUrl}}">
 {{/if}}