feat: convert all file inputs to FilePond for standardized uploading

- Add csv_import queue type (storeAsFile, no async upload) for CSV import dialog
- Convert file-field.php partial to FilePond with field-name→queue-type mapping
- Conditionally skip server config for storeAsFile queues in buildFilePondOptions
- Skip FilePond init for inputs inside closed <dialog> elements
- Trigger FilePond init when import dialog opens
- Load FilePond CSS/JS assets on admin index page

app/templates/admin/index.php

@@ -46,7 +46,7 @@ document.addEventListener('htmx:afterSwap',()=>{document.querySelectorAll('input
                 </button>
                 <?php endif; ?>
                 <button type="button" class="btn btn--primary btn--sm" id="import-dialog-btn"
-                        onclick="document.getElementById('import-dialog').showModal()">
+                        onclick="document.getElementById('import-dialog').showModal(); window.XamxamInitFilePonds()">
                     Importer
                 </button>
             </div>
@@ -214,7 +214,11 @@ document.addEventListener('htmx:afterSwap',()=>{document.querySelectorAll('input
         <div>
             <label for="csv_file">Fichier CSV</label>
             <div class="admin-file-input">
-                <input type="file" id="csv_file" name="csv_file" accept=".csv" required>
+                <input type="file" id="csv_file"
+                       name="csv_file"
+                       class="tfe-file-picker"
+                       data-queue-type="csv_import"
+                       required>
                 <small class="admin-file-hint">
                     Colonnes : Identifiant, Titre, Sous-titre, Auteur·ice(s), Contact, Promoteur·ice(s), Format, Année, AP, Orientation, Finalité, Mots-clés, Synopsis, Contexte, Remarques, Langue, Autorisation, License, taille, Points sur 20, lien BAIU<br>
                     Quatre premières lignes ignorées — Séparateur : virgule — UTF-8