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/public/admin/actions/delete.php

@@ -16,20 +16,14 @@ if (!isset($_POST['csrf_token'], $_SESSION['csrf_token'])
     exit;
 }
 
-$isBulk      = !empty($_POST['bulk']);
-$isDeleteAll = !empty($_POST['delete_all']);
+$isBulk = !empty($_POST['bulk']);
 
 try {
     $db = new Database();
 
     $logger = AdminLogger::make();
 
-    if ($isDeleteAll) {
-        $count = $db->deleteAllTheses();
-        $logger->logDeleteAllTheses($count);
-        App::flash('success', "$count TFE(s) supprimé(s) avec succès.");
-
-    } elseif ($isBulk) {
+    if ($isBulk) {
         $ids = array_filter(array_map('intval', $_POST['selected_theses'] ?? []), fn($id) => $id > 0);
 
         if (empty($ids)) {

app/public/admin/contenus.php

@@ -18,6 +18,7 @@ try {
     $pages          = array_values(array_filter($allPages, fn($p) => in_array($p['slug'], $allowedPageSlugs, true)));
     $aproposKeys    = $db->getAllAproposContents();
     $formHelpBlocks = $db->getAllFormHelpBlocks();
+    $siteSettings   = $db->getAllSettings();
 } catch (Exception $e) {
     error_log("Error loading contenus: " . $e->getMessage());
     die("Erreur lors du chargement des contenus.");

app/public/admin/index.php

@@ -349,18 +349,21 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST' && isset($_FILES['csv_file'])) {
                         }
                     }
                     if (!empty($languageRaw)) {
-                        $langName = strtolower(trim($languageRaw));
-                        // Lookup case-insensitively; insert if missing (stored lowercase).
-                        $s = $importPdo->prepare("SELECT id FROM languages WHERE LOWER(name) = LOWER(?)");
-                        $s->execute([$langName]);
-                        $r = $s->fetch();
-                        $langId = $r ? (int)$r['id'] : null;
-                        if ($langId === null) {
-                            $importPdo->prepare("INSERT INTO languages (name) VALUES (?)")->execute([$langName]);
-                            $langId = (int)$importPdo->lastInsertId();
+                        foreach (array_map('trim', explode(',', $languageRaw)) as $langName) {
+                            $langName = strtolower($langName);
+                            if ($langName === '') continue;
+                            // Lookup case-insensitively; insert if missing (stored lowercase).
+                            $s = $importPdo->prepare("SELECT id FROM languages WHERE LOWER(name) = LOWER(?)");
+                            $s->execute([$langName]);
+                            $r = $s->fetch();
+                            $langId = $r ? (int)$r['id'] : null;
+                            if ($langId === null) {
+                                $importPdo->prepare("INSERT INTO languages (name) VALUES (?)")->execute([$langName]);
+                                $langId = (int)$importPdo->lastInsertId();
+                            }
+                            $s2 = $importPdo->prepare("INSERT INTO thesis_languages (thesis_id, language_id) VALUES (?,?)");
+                            $s2->execute([$thesisId, $langId]);
                         }
-                        $s2 = $importPdo->prepare("INSERT INTO thesis_languages (thesis_id, language_id) VALUES (?,?)");
-                        $s2->execute([$thesisId, $langId]);
                     }
                     if (!empty($formatsRaw)) {
                         foreach (array_map('trim', explode(',', $formatsRaw)) as $fmt) {

app/public/admin/language-search-fragment.php

@@ -0,0 +1,13 @@
+<?php
+/**
+ * language-search-fragment.php (admin)
+ *
+ * HTMX fragment: returns matching language suggestions for the
+ * "Autre(s) langue(s)" interactive search input. Admin-auth gated wrapper.
+ */
+require_once __DIR__ . '/../../bootstrap.php';
+require_once __DIR__ . '/../../src/AdminAuth.php';
+
+AdminAuth::requireLogin();
+
+require_once APP_ROOT . '/public/partage/language-search-fragment.php';

app/public/admin/parametres.php

@@ -16,7 +16,6 @@ $siteSettings  = $db->getAllSettings();
 $peerTubeSettings   = PeerTubeService::getSettings($db);
 $peerTubeEnabled    = PeerTubeService::isEnabled($db);
 $peerTubeConfigured = PeerTubeService::isConfigured($db);
-$stats         = $db->getThesesStats();
 $smtpSettings   = SmtpRelay::getSettings($db);
 $smtpConfigured  = SmtpRelay::isConfigured($db);
 $smtpErrorField  = $_SESSION['_flash_smtp_field'] ?? null;