Add locale-aware link helper for consistent URLs

Ensures locale links include the full host (production or localhost) and
trailing slash, fixing broken links in different environments.

Author: thibaudgg

config.rb

@@ -37,4 +37,10 @@
   def current_page?(path)
     current_page.url.chomp('/') == path.chomp('/')
   end
+
+  def locale_link_to(text, path, options = {})
+    path = "#{path}/" unless path.end_with?('/')
+    host = build? ? data.site.host : "http://localhost:#{config[:port]}"
+    link_to(text, "#{host}#{path}", options)
+  end
 end

source/_footer.erb

@@ -1,19 +1,19 @@
 <footer class="w-full pt-32 pb-4">
   <ul class="flex justify-center items-center tracking-tight gap-2 text-lg">
     <li>
-      <%= link_to "EN", "/", class: "font-semibold p-1 #{"active" unless current_page?("/") }" %>
+      <%= locale_link_to "EN", "/", class: "font-semibold p-1 #{"active" unless current_page?("/")}" %>
     </li>
     <li class="text-gray-400 font-extralight text-xs">
       /
     </li>
     <li>
-      <%= link_to "FR", '/acp/', class: "font-semibold p-1 #{"active" unless current_page?('/acp/') }" %>
+      <%= locale_link_to "FR", "/acp", class: "font-semibold p-1 #{"active" unless current_page?("/acp/")}" %>
     </li>
     <li class="text-gray-400 font-extralight text-xs">
       /
     </li>
     <li>
-      <%= link_to 'DE', '/solawi/', class: "font-semibold p-1 #{"active" unless current_page?('/solawi/') }" %>
+      <%= locale_link_to "DE", "/solawi", class: "font-semibold p-1 #{"active" unless current_page?("/solawi/")}" %>
     </li>
   </ul>
 

source/_header.erb

@@ -3,19 +3,19 @@
     <%= inline_svg 'logo.svg', class: 'fill-current w-10 h-10 md:w-12 md:h-12', alt: t("logo_alt") %>
     <nav class="text-logo-green ml-3 font-bold text-2xl tracking-tight flex items-center">
       <span>
-        <%= link_to "CSA", "/", class: "font-bold  #{"no-underline" unless I18n.locale == :en} decoration-2 hover:underline" %>
+        <%= locale_link_to "CSA", "/", class: "font-bold #{"no-underline" unless I18n.locale == :en} decoration-2 hover:underline" %>
       </span>
       <span class="font-extralight text-base px-1 md:px-2">
         /
       </span>
       <span>
-        <%= link_to "ACP", "/acp/", class: "font-bold #{"no-underline" unless I18n.locale == :fr} decoration-2 hover:underline" %>
+        <%= locale_link_to "ACP", "/acp", class: "font-bold #{"no-underline" unless I18n.locale == :fr} decoration-2 hover:underline" %>
       </span>
       <span class="font-extralight text-base px-1 md:px-2">
         /
       </span>
       <span>
-        <%= link_to "Solawi", "/solawi/", class: "font-bold #{"no-underline" unless I18n.locale == :de} decoration-2 hover:underline" %>
+        <%= locale_link_to "Solawi", "/solawi", class: "font-bold #{"no-underline" unless I18n.locale == :de} decoration-2 hover:underline" %>
       </span>
       <span class="ml-3">
         Admin