Fix sharing email link broken by email obfuscation PR

The email obfuscation PR (#2815) incorrectly replaced the "share via
email" link with the author's email as recipient. Sharing links have no
email address to obfuscate — they just open a mailto: with the article
URL and title prefilled.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

layouts/partials/sharing-links.html

@@ -3,15 +3,10 @@
   <section class="flex flex-row flex-wrap justify-center pt-4 text-xl">
     {{ range . }}
       {{ with index $links . }}
-        {{ $isEmail := eq .icon "email" }}
         <a
-          class="{{ cond $isEmail "email-link" "" }} m-1 rounded bg-neutral-300 p-1.5 text-neutral-700 hover:bg-primary-500 hover:text-neutral dark:bg-neutral-700 dark:text-neutral-300 dark:hover:bg-primary-400 dark:hover:text-neutral-800"
+          class="m-1 rounded bg-neutral-300 p-1.5 text-neutral-700 hover:bg-primary-500 hover:text-neutral dark:bg-neutral-700 dark:text-neutral-300 dark:hover:bg-primary-400 dark:hover:text-neutral-800"
           target="_blank"
-          href="{{ cond $isEmail "#" (printf .url $.Permalink $.Title | safeURL) }}"
-          {{ if $isEmail }}
-            data-email="{{ $.Site.Params.Author.email | base64Encode }}"
-            data-subject="{{ replace (printf "Reply to %s" $.Title) "\"" "'" }}"
-          {{ end }}
+          href="{{ printf .url $.Permalink $.Title | safeURL }}"
           title="{{ i18n .title }}"
           aria-label="{{ i18n .title }}">
           {{ partial "icon.html" .icon }}