feat: allow exporting an empty CSV template for imports

TODO.md

@@ -44,3 +44,6 @@
 - [x] PDF viewer: add dark transparent violet background behind pages when expanded
 - [x] pdf-viewer: expand to fill right column (not whole page), center pages, freeze column on expand
 - [x] pdf-viewer: fix toolbar width (align-self:stretch), hide sibling file items when expanded
+- [x] Allow admin to export an empty CSV template (headers only) from the import dialog for use as an import model
+- [x] Fix import modal missing FilePond styling: bundling refactor dropped filepond CSS + file-upload-filepond.js wrapper from admin list page (pre-existing regression)
+- [x] Move 'download empty CSV template' button onto the same line as the Fichier CSV heading (button on the right, styled as btn)

app/public/admin/actions/export.php

@@ -20,6 +20,7 @@ require_once APP_ROOT . '/src/ErrorHandler.php';
 $doCsv   = !empty($_GET['csv']);
 $doFiles = !empty($_GET['files']);
 $doDb    = !empty($_GET['db']);
+$doTemplate = !empty($_GET['template']);
 
 // Optional: filter by selected thesis IDs (bulk selection export)
 $idsRaw = $_GET['ids'] ?? '';
@@ -33,12 +34,30 @@ if ($idsRaw !== '') {
     }
 }
 
-if (!$doCsv && !$doFiles && !$doDb) {
+if (!$doCsv && !$doFiles && !$doDb && !$doTemplate) {
     $doCsv = true;
 }
 
 $controller = ExportController::create();
 
+// Empty CSV template: stream only the header row (no data).
+if ($doTemplate) {
+    AdminLogger::make()->logCsvExport();
+
+    $filename = 'xamxam-template.csv';
+
+    header('Content-Type: text/csv; charset=UTF-8');
+    header('Content-Disposition: attachment; filename="' . $filename . '"');
+    header('Cache-Control: no-cache, must-revalidate');
+
+    echo "\xEF\xBB\xBF";
+
+    $out = fopen('php://output', 'w');
+    fputcsv($out, ExportController::CSV_HEADERS, ',', '"', '');
+    fclose($out);
+    exit;
+}
+
 if ($doCsv) {
     AdminLogger::make()->logCsvExport();
 

app/public/admin/index.php

@@ -581,8 +581,8 @@ if ($isHtmx) {
         include APP_ROOT . '/templates/admin/index-table.php';
     }
 } else {
-    $extraCssAdmin = [];
+    $extraCssAdmin = ['/assets/css/filepond.min.css', '/assets/css/filepond-plugin-image-preview.min.css'];
-    $extraJs  = ['/assets/js/vendor/filepond.min.js', '/assets/js/vendor/filepond-plugin-file-validate-type.min.js', '/assets/js/vendor/filepond-plugin-file-validate-size.min.js', '/assets/js/vendor/filepond-plugin-image-preview.min.js', '/assets/js/vendor/filepond-plugin-image-exif-orientation.min.js', '/assets/dist/admin.min.js'];
+    $extraJs  = ['/assets/js/vendor/filepond.min.js', '/assets/js/vendor/filepond-plugin-file-validate-type.min.js', '/assets/js/vendor/filepond-plugin-file-validate-size.min.js', '/assets/js/vendor/filepond-plugin-image-preview.min.js', '/assets/js/vendor/filepond-plugin-image-exif-orientation.min.js', '/assets/dist/admin.min.js', '/assets/js/app/file-upload-filepond.js'];
     require_once APP_ROOT . '/templates/head.php';
     include APP_ROOT . '/templates/header.php';
     if ($tab === 'trash') {

app/public/assets/css/admin.css

@@ -757,6 +757,15 @@ th.admin-ap-col {
   margin-top: var(--space-2xs);
 }
 
+/* Import dialog: Fichier CSV heading + empty-CSV-template button on one line (button on the right) */
+.admin-file-label-row {
+	display: flex;
+	align-items: center;
+	justify-content: space-between;
+	gap: var(--space-s);
+	margin-bottom: var(--space-2xs);
+}
+
 /* Error list inside role="alert" */
 .admin-error-list {
   margin: var(--space-2xs) 0 0;

app/templates/admin/partials/dialogs/import.php

@@ -49,7 +49,12 @@ if (!class_exists('ExportController')) {
         <input type="hidden" name="csrf_token" value="<?= htmlspecialchars($_SESSION['csrf_token']) ?>">
 
         <div>
+            <div class="admin-file-label-row">
                 <label for="csv_file">Fichier CSV</label>
+                <a href="/admin/actions/export.php?template=1" download class="btn btn--secondary btn--sm">
+                    &#x2913; Télécharger un modèle CSV vide
+                </a>
+            </div>
             <div class="admin-file-input">
                 <input type="file" id="csv_file"
                        name="csv_file"

docs/import.md

@@ -6,6 +6,16 @@ Import of theses from the admin panel, plus the CSV structure and behaviour.
 > `app/public/admin/index.php` — there is no separate `import.php` action. The
 > `/admin/import.php` file only redirects to `/admin/`.
 
+### Import modal
+
+The import dialog (`app/templates/admin/partials/dialogs/import.php`) lets the
+user pick a CSV file and submit it. It also exposes an **export empty CSV**
+button, labelled **“Télécharger un modèle CSV vide”**, shown beside the “Fichier
+CSV” label. It links to `/admin/actions/export.php?template=1` and downloads a
+blank CSV whose header row matches the export headers (`ExportController::CSV_HEADERS`,
+see below) so you can fill it in and re-import it.
+
+
 ---
 
 ## File format