CourseHub: AJAX video course player (PHP + MySQL + Bootstrap + Plyr)

Scans nested course folders for mp4s, tracks per-user resume position
and per-folder progress. SPA frontend with hash routing over a JSON API;
range-request streaming via stream.php.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

index.php

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+<?php /* CourseHub SPA shell — all data flows through api/ via fetch. */ ?>
+<!doctype html>
+<html lang="en" data-bs-theme="dark">
+<head>
+<meta charset="utf-8">
+<meta name="viewport" content="width=device-width, initial-scale=1">
+<title>CourseHub</title>
+<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet">
+<link href="https://cdn.jsdelivr.net/npm/bootstrap-icons@1.11.3/font/bootstrap-icons.min.css" rel="stylesheet">
+<link href="https://cdn.jsdelivr.net/npm/plyr@3.7.8/dist/plyr.css" rel="stylesheet">
+<link href="assets/style.css" rel="stylesheet">
+</head>
+<body>
+
+<nav class="navbar navbar-expand-lg bg-body-tertiary border-bottom mb-4">
+  <div class="container">
+    <a class="navbar-brand fw-bold" href="#/">
+      <i class="bi bi-collection-play-fill text-primary me-1"></i>CourseHub
+    </a>
+    <div id="nav-user" class="d-none d-flex align-items-center gap-3">
+      <button id="btn-rescan" class="btn btn-sm btn-outline-secondary">
+        <i class="bi bi-arrow-repeat me-1"></i>Rescan library
+      </button>
+      <span class="text-secondary small">
+        <i class="bi bi-person-circle me-1"></i><span id="nav-username"></span>
+      </span>
+      <button id="btn-logout" class="btn btn-sm btn-outline-danger">Logout</button>
+    </div>
+  </div>
+</nav>
+
+<main class="container pb-5">
+  <div id="app">
+    <div class="text-center py-5">
+      <div class="spinner-border text-primary" role="status"></div>
+    </div>
+  </div>
+</main>
+
+<div class="toast-container position-fixed bottom-0 end-0 p-3" id="toasts"></div>
+
+<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
+<script src="https://cdn.jsdelivr.net/npm/plyr@3.7.8/dist/plyr.min.js"></script>
+<script src="assets/app.js"></script>
+</body>
+</html>