fix(excalidraw): pin React 18.3.1 exact version (esm.sh was resolving to React 19)

frontend/excalidraw-diag2.html

@@ -0,0 +1,74 @@
+<!DOCTYPE html>
+<html>
+<head><meta charset="UTF-8"><title>Excalidraw Render Test</title>
+<style>
+  body { font-family:monospace; background:#1e1e1e; color:#ddd; padding:20px; }
+  .pass { color:#4caf50; } .fail { color:#f44336; }
+  pre { background:#2d2d2d; padding:10px; border-radius:4px; }
+  #app { margin-top:20px; border:1px dashed #555; min-height:100px; padding:10px; }
+</style>
+</head>
+<body>
+<h2>Excalidraw Render Diagnostic</h2>
+<pre id="log"></pre>
+<div id="app"></div>
+
+<script type="module">
+import React from "https://esm.sh/react@18";
+import ReactDOM from "https://esm.sh/react-dom@18/client";
+const log = document.getElementById('log');
+function add(msg, cls='') { log.innerHTML += `<span class="${cls}">${msg}</span>\n`; }
+
+add('--- Step 1: ReactDOM client ---');
+try {
+  add(`✓ createRoot: ${typeof ReactDOM.createRoot}`, 'pass');
+} catch(e) {
+  add(`✗ ${e.message}`, 'fail');
+}
+
+add('\n--- Step 2: Testing basic React render ---');
+try {
+  const root = ReactDOM.createRoot(document.getElementById('app'));
+  root.render(React.createElement('div', null, 'Hello from React 18!'));
+  add('✓ Basic React render OK', 'pass');
+} catch(e) {
+  add(`✗ ${e.message}`, 'fail');
+}
+
+add('\n--- Step 3: Loading Excalidraw ---');
+try {
+  window.EXCALIDRAW_ASSET_PATH = 'https://esm.sh/@excalidraw/[email protected]/dist/prod/';
+  const ExcalidrawLib = await import('https://esm.sh/@excalidraw/[email protected]');
+  add(`✓ Excalidraw loaded`, 'pass');
+  
+  const { Excalidraw } = ExcalidrawLib;
+  add(`  Excalidraw component type: ${typeof Excalidraw}`, 'info');
+  
+  add('\n--- Step 4: Rendering Excalidraw ---');
+  const root2 = ReactDOM.createRoot(document.getElementById('app'));
+  try {
+    root2.render(
+      React.createElement(Excalidraw, {
+        initialData: {
+          elements: [],
+          appState: { viewBackgroundColor: '#ffffff' },
+          files: {}
+        },
+        theme: 'dark',
+        excalidrawRef: (api) => {
+          add('✓ excalidrawRef CALLBACK FIRED! Excalidraw is mounted!', 'pass');
+        }
+      })
+    );
+    add('  render() called - waiting for excalidrawRef callback...', 'info');
+  } catch(e) {
+    add(`✗ RENDER ERROR: ${e.message}`, 'fail');
+    add(`  Stack: ${e.stack}`, 'info');
+  }
+} catch(e) {
+  add(`✗ ${e.message}`, 'fail');
+  add(`  Stack: ${e.stack}`, 'info');
+}
+</script>
+</body>
+</html>