Re-vendor boostlook with boostorg#2535 review fixes

Picks up boostlook 24744f4: the inline-code reset now also matches the leaf case where the boostlook class sits on the code's direct parent, and Asciidoctor .sectN headings get their gap back inside markdown cards. Build output only.

Refs boostorg#2399, boostorg#2535.

Author: julioest

static/css/v3/boostlook-v3.css

@@ -984,7 +984,13 @@ html:not(.v3):has(.boostlook) {
   /* Prevent text overflow */
 }
 
-.boostlook :not(pre):not([class^="L"]) > code {
+/* Two forms of the same reset: the code's parent may be a descendant of the
+   .boostlook element (doc/container case, e.g. div.boostlook > p > code) or the
+   .boostlook element itself (leaf case, e.g. p.boostlook > code — used by the
+   website-v2 site components). Covering both keeps inline code from falling
+   through to the host page's global `code` color. */
+.boostlook :not(pre):not([class^="L"]) > code,
+.boostlook:not(pre):not([class^="L"]) > code {
   /* overrides builtin colors */
   color: var(--text-code-text, #050816);
   border: 0;
@@ -5731,6 +5737,13 @@ html.v3 .boostlook {
 .boostlook.markdown-content h5,
 .boostlook.markdown-content h6 { font-size: var(--font-size-small); }
 
+/* Asciidoctor wraps each heading in a .sectN div, so it isn't a direct flex child and the
+   container gap can't space it — the `margin: 0` above collapses it against its body text.
+   Restore the gap, scoped to the nested case so flat markdown doesn't double up. #2535. */
+.boostlook.markdown-content :is(.sect1, .sect2, .sect3) > :is(h1, h2, h3, h4, h5, h6) {
+  margin-bottom: var(--space-default);
+}
+
 .boostlook.markdown-content b,
 .boostlook.markdown-content strong {
   color: var(--color-text-primary);
@@ -5816,7 +5829,8 @@ html.v3 .boostlook {
 
 /* Release highlights card (what's-new via inline_markdown) — #2491. inline_markdown
    emits only <strong> and <code>; layout/base type stays in release-highlights-card.css.
-   Bold uses the site's medium weight; inline code inherits boostlook's treatment. */
+   Bold uses the site's medium weight; inline code inherits boostlook's treatment (the
+   leaf-case reset in 04-reset.css covers `p.boostlook > code`). */
 .boostlook.release-highlight__description strong {
   font-weight: var(--font-weight-medium);
 }