Merge duplicate prefers-reduced-motion media queries

Consolidate the two @media (prefers-reduced-motion: no-preference) blocks
into one — scroll-behavior and theme-switch colour transitions share the
same query and are cleaner in a single block.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/media/css/template.css

@@ -22,15 +22,12 @@
 	box-sizing: border-box;
 }
 
+/* Smooth scroll and colour transitions; gated so reduced-motion users are unaffected. */
 @media (prefers-reduced-motion: no-preference) {
 	:root {
 		scroll-behavior: smooth;
 	}
-}
 
-/* Smooth colour transition when the data-bs-theme attribute changes between light and dark.
-   Scoped to no-preference so users who opt out of motion also skip colour flashes. */
-@media (prefers-reduced-motion: no-preference) {
 	:root,
 	body,
 	.container-wrapper,