feat(footer): hover-glow links to lyxlimo + karleksguiden (#25)

MainLayout footer now includes attribution: 'Crafting digital
experiences for lyxlimo.se & karleksguiden.se' visible on all pages.

On index page only: hovering lyxlimo.se tints hero-logo with
green (#4fd1c5 teal), hovering karleksguiden.se tints with
magenta (#c026d3). Mouseleave restores default white smoky-path
animation. Mechanism reuses existing data-logo-tint attribute on
#text-wrapper.

Removed logo-pulse functionality entirely (threadLogoIn/Out paths,
runLogoPulse function, LOGO_PROBABILITY, updateLogoThreadPaths,
resize/scroll listeners for logo threads). Hover-based UX replaces
the random pulse approach per Linus design preference.

src/layouts/MainLayout.astro

@@ -30,6 +30,12 @@ const { title } = Astro.props;
     </main>
 
     <footer class="border-t border-neutral-800 py-8 text-center text-gray-500 text-sm bg-neutral-900 relative z-40">
+      <p class="mb-2">
+        Crafting digital experiences for
+        <a href="https://lyxlimo.se/" target="_blank" rel="noopener noreferrer" data-glow-link="green" class="text-gray-400 hover:text-white transition-colors">lyxlimo.se</a>
+        &amp;
+        <a href="https://karleksguiden.se/" target="_blank" rel="noopener noreferrer" data-glow-link="magenta" class="text-gray-400 hover:text-white transition-colors">karleksguiden.se</a>
+      </p>
       <p>&copy; {new Date().getFullYear()} Images by Olofsson. All rights reserved.</p>
     </footer>