Add language-search component for Autre Langue input + active search in lists

Mirrors the mots-clé tag-search system: dropdown suggestions from
existing languages via HTMX, pill display with bin-icon remove buttons,
'Créer' option for new languages. Replaces the plain text input.

- New partial: templates/partials/form/language-search.php
- New fragment: public/partage/language-search-fragment.php
- Admin wrapper: public/admin/language-search-fragment.php
- Updated language-autre-fragment to return just the required asterisk indicator
- Updated both controllers to handle language_autre as array (pill-based)
  with backward-compatible string path
- Updated edit form to compute selectedOtherLanguages from DB
- Registered new route in partage/index.php
- Fix CSV importer: split comma-separated language column into individual entries
- Add htmx active search to admin index, title line-clamp, predefined languages only in checkboxes
- Admin index: filter form now uses htmx triggers (input delay:300ms on search,
  change on selects) to actively search without page reload
- Sort links include hx-push-url for back-button support
- Added loading indicator bar (.admin-search-indicator)
- Title column: line-clamp at 2 lines with overflow hidden, native title attr
  tooltip for full text
- Language checkboxes now show only 3 predefined languages (Français, Anglais,
  Néerlandais); all others go via the Autre langue search component
- Added Database::getPredefinedLanguages() and excluded predefined from
  language-search-fragment suggestions
- Included hidden sort/dir inputs in table-wrap so sort state preserved across
  filter changes
- Fix language-search: block 'Créer' for predefined languages in dropdown
  The 'Créer' option in the language-search dropdown now also checks against the
  predefined set (français, anglais, néerlandais) to avoid offering creation of
  languages that already exist as checkboxes.

app/templates/admin/contenus.php

@@ -11,6 +11,116 @@
     <div class="flash-error" role="alert"><?= htmlspecialchars($flash['error']) ?></div>
     <?php endif; ?>
 
+    <!-- ═══════════════════════════════════════════════════════════════════
+         PARAMÈTRES DU FORMULAIRE
+         ═══════════════════════════════════════════════════════════════════ -->
+    <h2 id="form-settings-title">Paramètres du Formulaire</h2>
+
+    <!-- ── Restrictions d'accès aux fichiers ── -->
+    <section aria-labelledby="form-restricted-files-title">
+        <h3 id="form-restricted-files-title">Restrictions d'accès aux fichiers</h3>
+
+        <form method="post" action="actions/settings.php" class="param-form">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
+            <input type="hidden" name="section" value="formulaire">
+
+            <label class="param-checkbox">
+                <input type="checkbox" name="restricted_files_enabled" value="1"
+                       <?= ($siteSettings['restricted_files_enabled'] ?? '0') === '1' ? 'checked' : '' ?>>
+                <span>
+                    <strong>Activer la restriction d'accès</strong><br>
+                    <small>Pour les TFE de type "Interne", masquer les fichiers et exiger une demande d'accès par email. Les métadonnées et le résumé restent visibles publiquement.</small>
+                </span>
+            </label>
+
+            <button type="submit" class="btn btn--primary">Enregistrer</button>
+        </form>
+    </section>
+
+    <!-- ── Degré d'ouverture ── -->
+    <section aria-labelledby="form-access-types-title">
+        <h3 id="form-access-types-title">Degré d'ouverture</h3>
+        <p>Options de visibilité disponibles dans le formulaire d'ajout de TFE.</p>
+        <p class="param-note">L'option <strong>Libre</strong> ne sera activée qu'à partir de l'année académique prochaine.</p>
+
+        <form method="post" action="actions/settings.php" class="param-form">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
+            <input type="hidden" name="section" value="formulaire">
+
+            <label class="param-checkbox">
+                <input type="checkbox" name="access_type_interdit_enabled" value="1"
+                       <?= ($siteSettings['access_type_interdit_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
+                <span>
+                    <strong>Interdit</strong><br>
+                    <small>TFE non disponible en physique ni sur le site</small>
+                </span>
+            </label>
+
+            <label class="param-checkbox">
+                <input type="checkbox" name="access_type_interne_enabled" value="1"
+                       <?= ($siteSettings['access_type_interne_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
+                <span>
+                    <strong>Interne</strong><br>
+                    <small>TFE accessible uniquement sur place en physique</small>
+                </span>
+            </label>
+
+            <label class="param-checkbox param-checkbox--disabled">
+                <input type="checkbox" name="access_type_libre_enabled" value="1"
+                       <?= ($siteSettings['access_type_libre_enabled'] ?? '0') === '1' ? 'checked' : '' ?>>
+                <span>
+                    <strong>Libre</strong><br>
+                    <small>Libre accès — disponible à partir de l'année académique prochaine</small>
+                </span>
+            </label>
+
+            <button type="submit" class="btn btn--primary">Enregistrer</button>
+        </form>
+    </section>
+
+    <!-- ── Types de travaux ── -->
+    <section aria-labelledby="form-objet-types-title">
+        <h3 id="form-objet-types-title">Types de travaux</h3>
+        <p>Active ou désactive les types de travaux dans les formulaires et la consultation. Un type désactivé ne peut plus être soumis ni affiché sur le site.</p>
+        <p class="param-note">Le type <strong>TFE</strong> est toujours actif et ne peut pas être désactivé.</p>
+
+        <form method="post" action="actions/settings.php" class="param-form">
+            <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
+            <input type="hidden" name="section" value="objet_types">
+
+            <label class="param-checkbox param-checkbox--disabled">
+                <input type="checkbox" disabled checked>
+                <span>
+                    <strong>TFE</strong><br>
+                    <small>Travail de fin d'études — toujours actif</small>
+                </span>
+            </label>
+
+            <label class="param-checkbox">
+                <input type="checkbox" name="objet_these_enabled" value="1"
+                       <?= ($siteSettings['objet_these_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
+                <span>
+                    <strong>Thèse</strong><br>
+                    <small>Thèses doctorales</small>
+                </span>
+            </label>
+
+            <label class="param-checkbox">
+                <input type="checkbox" name="objet_frart_enabled" value="1"
+                       <?= ($siteSettings['objet_frart_enabled'] ?? '1') === '1' ? 'checked' : '' ?>>
+                <span>
+                    <strong>Frart</strong><br>
+                    <small>Formation de recherche en art</small>
+                </span>
+            </label>
+
+            <button type="submit" class="btn btn--primary">Enregistrer</button>
+        </form>
+    </section>
+
+    <!-- ═══════════════════════════════════════════════════════════════════
+         PAGES STATIQUES
+         ═══════════════════════════════════════════════════════════════════ -->
     <h2>Pages statiques</h2>
 
     <table>
@@ -39,14 +149,13 @@
         </tbody>
     </table>
 
-    <!-- ═══════════════════════════════════════════════════════════════════
-         Structure du formulaire étudiant·e
-         ═══════════════════════════════════════════════════════════════════ -->
-    <h2 id="form-help-blocks" style="margin-top:2rem;">Structure du formulaire étudiant·e</h2>
-    <p class="fhb-hint">
-        Chaque <strong>bloc d'aide</strong> s'affiche au-dessus de sa section dans le formulaire de soumission.
-        Le <strong>bouton rond</strong> active/désactive l'affichage.
-    </p>
+    <!-- ── Structure du formulaire ── -->
+    <section aria-labelledby="form-help-blocks">
+        <h3 id="form-help-blocks">Structure du Formulaire</h3>
+        <p class="fhb-hint">
+            Chaque <strong>bloc d'aide</strong> s'affiche au-dessus de sa section dans le formulaire de soumission.
+            Le <strong>bouton rond</strong> active/désactive l'affichage.
+        </p>
 
     <?php
     $blocks = $formHelpBlocks;
@@ -123,6 +232,7 @@
             <?php endif; ?>
         <?php endforeach; ?>
     </div>
+    </section>
 
 </main>