feat: upload progress bar — fieldset layout, accent colors, file name display, completion animation, 800ms redirect delay; decorelate formats from fichiers; server-side poll via token; bump PeerTube embed audio player

app/public/admin/actions/upload-progress.php

@@ -0,0 +1,43 @@
+<?php
+/**
+ * upload-progress.php
+ *
+ * Returns the current upload/processing progress for a given token.
+ * Called by the client-side upload-progress.js while the form XHR is in flight.
+ *
+ * GET /admin/actions/upload-progress.php?token=<token>
+ *
+ * Response: JSON
+ *   { "stage": "upload"|"processing"|"done", "pct": 45, "file": "video.mp4" }
+ *
+ * Progress data is written by ThesisEditController / ThesisCreateController
+ * to a temp file during processing.
+ */
+
+require_once __DIR__ . '/../../../bootstrap.php';
+require_once __DIR__ . '/../../../src/AdminAuth.php';
+AdminAuth::requireLogin();
+
+header('Content-Type: application/json');
+
+$token = $_GET['token'] ?? '';
+if (!preg_match('/^[a-f0-9]{16}$/', $token)) {
+    echo json_encode(['stage' => 'error', 'error' => 'Invalid token']);
+    exit;
+}
+
+$progressFile = sys_get_temp_dir() . '/xamxam_upload_' . $token . '.json';
+
+if (!file_exists($progressFile)) {
+    // No progress file yet — still in upload phase (or token invalid)
+    echo json_encode(['stage' => 'upload', 'pct' => 0, 'file' => '']);
+    exit;
+}
+
+$data = json_decode(file_get_contents($progressFile), true);
+if (!$data) {
+    echo json_encode(['stage' => 'upload', 'pct' => 0, 'file' => '']);
+    exit;
+}
+
+echo json_encode($data);