✨ v3 theme: glass UI, landing layout, a11y, perf, print styles

Floating glass header with ⌘K search, landing homepage layout with
hero image and GitHub-stars CTA, background canvas with dissolving
heroes, burufugu colour scheme, movie-quote 404, taxonomy pills,
keyboard/ARIA accessibility across menus, search and tabs, idle-
loaded third-party scripts, and dedicated print styles.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

layouts/partials/article-link/_shortcode.html

@@ -98,7 +98,7 @@
         loading="lazy"
         decoding="async"
         fetchpriority="low"
-        class="not-prose absolute inset-0 h-full w-full object-cover transition duration-500 {{ if $featureImageHover }}group-hover:scale-105{{ end }}"
+        class="not-prose absolute inset-0 h-full w-full object-cover transition-transform duration-700 ease-[cubic-bezier(0.22,1,0.36,1)] {{ if $featureImageHover }}group-hover:scale-[1.03]{{ end }}"
         {{ with $featureImagePosition }}style="object-position: {{ . }};"{{ end }} />
     </div>
   {{ end }}