fix(a11y): titres de page, cas d'usages — liens, liste, tableau (NC 5.3, 6.1, 8.5, 9.3, 13.2)

Titres de page (NC 8.5):
- home AE/AP, accessibility, mentions, errors, profile, changelogs: content_for :title

Cas d'usages:
- _others: div.use_cases → ul.fr-raw-list + li (NC 9.3)
  + aria-label contextuel sur les liens "En savoir plus" (NC 6.1)
- _simplifions_card: fr-sr-only "(ouverture dans un nouvel onglet)" (NC 13.2)
- _endpoints_table: <caption class="fr-sr-only"> (NC 5.3)
- index AE/AP: content_for :title (NC 8.5)

Partially solves API-6952

Author: Samuelfaure

site/app/views/api_entreprise/cas_usages/index.html.erb

@@ -1,3 +1,4 @@
+<% content_for :title, t('.title') %>
 <div id="cas-usages" class="fr-container--fluid">
   <div class="banner fr-pt-5w fr-pb-8w">
     <div class="fr-container">

site/app/views/api_entreprise/pages/home.html.erb

@@ -1,3 +1,4 @@
+<% content_for :title, 'Accueil' %>
 <div id="homepage">
   <%= render 'shared/pages/home_alerts' %>
   <%= render 'api_entreprise/pages/home/section_welcome' %>

site/app/views/api_particulier/cas_usages/index.html.erb

@@ -1,3 +1,4 @@
+<% content_for :title, t('.title') %>
 <div id="cas-usages" class="fr-container--fluid">
   <div class="banner fr-pt-5w fr-pb-8w">
     <div class="fr-container">

site/app/views/api_particulier/pages/home.html.erb

@@ -1,3 +1,4 @@
+<% content_for :title, 'Accueil' %>
 <div id="homepage">
   <%= render 'shared/pages/home_alerts' %>
   <%= render 'api_particulier/pages/home/section_welcome' %>

site/app/views/errors/show.html.erb

@@ -1,3 +1,4 @@
+<% content_for :title, t(".#{@rescue_response}.title", default: 'Erreur') rescue content_for :title, 'Erreur' %>
 <div class="fr-container fr-mb-12w fr-mt-12w center">
   <h1 class="text-xl">
     <%= t(".#{@rescue_response}.title") %>

site/app/views/shared/cas_usages/_endpoints_table.html.erb

@@ -1,5 +1,6 @@
 <div class="fr-table">
   <table>
+    <caption class="fr-sr-only">API disponibles pour ce cas d'usage</caption>
     <thead>
       <tr>
         <th scope="col"><%= t('.headers.api') %></th>

site/app/views/shared/cas_usages/_others.html.erb

@@ -1,11 +1,15 @@
 <h3><%= t('.title').html_safe %></h3>
-<div class="use_cases">
+<ul class="use_cases fr-raw-list">
   <% @other_fiches_pratiques.sample(3).each do |use_case| %>
-    <div class="use_case fr-mt-4v">
+    <li class="use_case fr-mt-4v">
       <%= image_tag("#{api}/cas_usages/pictos/#{use_case.uid}.svg", alt: "") %>
       <h4><%= t(".#{use_case.uid}.title") %></h4>
       <p><%= t(".#{use_case.uid}.description") %></p>
-      <%= link_to t('.link'), cas_usage_path(use_case.uid), class: "fr-btn fr-btn--secondary" %>
-    </div>
+      <%= link_to cas_usage_path(use_case.uid),
+            class: "fr-btn fr-btn--secondary",
+            aria: { label: "#{t('.link')} — #{t(".#{use_case.uid}.title")}" } do %>
+        <%= t('.link') %>
+      <% end %>
+    </li>
   <% end %>
-</div>
+</ul>

site/app/views/shared/cas_usages/_simplifions_card.html.erb

@@ -3,7 +3,7 @@
     <div class="fr-card__content">
       <h3 class="fr-card__title fr-h5">
         <%= link_to use_case.url, target: '_blank', rel: 'noopener noreferrer' do %>
-          <% if use_case.icon.present? %><span aria-hidden="true"><%= use_case.icon %></span> <% end %><%= use_case.name %>
+          <% if use_case.icon.present? %><span aria-hidden="true"><%= use_case.icon %></span> <% end %><%= use_case.name %><span class="fr-sr-only"> (ouverture dans un nouvel onglet)</span>
         <% end %>
       </h3>
       <p class="fr-card__desc"><%= use_case.description %></p>

site/app/views/shared/changelogs/index.html.erb

@@ -1,3 +1,4 @@
+<% content_for :title, t('.title') %>
 <div class="fr-grid-row">
   <div class="fr-col-12 fr-col-md-9 fr-col-lg-8">
     <h1 class="fr-mb-2w">

site/app/views/shared/pages/accessibility.html.erb

@@ -1,3 +1,4 @@
+<% content_for :title, 'Accessibilité' %>
 <div class="fr-grid-row">
   <div class="fr-col-12 fr-col-sm-8 fr-col-offset-sm-2">
     <h1 class="center">