debug: add console logs to trace loading failure

index.html

@@ -927,6 +927,7 @@ function updateQuote(q, isDemo) {
 // ── Main load ────────────────────────────────────────────────────────────────
 async function load() {
   const { symbol, interval, outputSize, apiKey } = state;
+  console.log('[TD] load() called', { symbol, interval, outputSize, apiKey });
   const loader = document.getElementById('loading-indicator');
   loader.classList.add('visible');
   loader.textContent = 'Loading…';
@@ -939,6 +940,8 @@ async function load() {
       fetchSeries(symbol, interval, outputSize, apiKey),
       fetchQuote(symbol, apiKey),
     ]);
+    console.log('[TD] series:', series?.data?.length, 'points, demo:', series?.demo, 'error:', series?.error);
+    console.log('[TD] quote:', quoteData?.q?.close, 'demo:', quoteData?.demo);
 
     const errorEl = document.getElementById('chart-error');
     const errorMsg = document.getElementById('chart-error-msg');
@@ -966,8 +969,10 @@ function switchTab(name) {
 }
 
 document.addEventListener('DOMContentLoaded', () => {
+  console.log('[TD] DOMContentLoaded');
+  console.log('[TD] LightweightCharts available:', typeof LightweightCharts);
   document.getElementById('api-key-input').value = state.apiKey;
-  initCharts();
+  try { initCharts(); console.log('[TD] initCharts OK'); } catch(e) { console.error('[TD] initCharts FAILED:', e); }
   load();
 
   // Symbol input