refactor: Move drawing tools to TradingView-style left toolbar

- Move drawing tools from right-side popup to left sidebar
- Add toggle button for desktop (right sidebar) and mobile (bottom nav)
- Implement collapsible toolbar with 6 drawing tools
- Add visual hover effects matching TradingView style

js/ui/chart.js

@@ -502,6 +502,8 @@ constructor() {
     initPriceScaleControls() {
         const btnSettings = document.getElementById('btnSettings');
         const settingsPopup = document.getElementById('settingsPopup');
+        const toggleToolbarBtn = document.getElementById('toggleChartToolbar');
+        const chartToolbar = document.getElementById('chartToolbar');
         
         // Settings Popup Toggle and Outside Click
         if (btnSettings && settingsPopup) {
@@ -523,6 +525,13 @@ constructor() {
             }
         }
         
+        // Toggle Chart Toolbar
+        if (toggleToolbarBtn && chartToolbar) {
+            toggleToolbarBtn.addEventListener('click', () => {
+                chartToolbar.style.display = chartToolbar.style.display === 'flex' ? 'none' : 'flex';
+            });
+        }
+        
         // Drawing Tools
         this.initDrawingTools();