Fix chart data labels RTL alignment issue

- Force LTR direction on chart canvas elements via CSS
- Add locale: 'en-US' to chart options for consistent number formatting
- Add textDirection: 'ltr' to datalabels and tooltip configs
- Fixes background/text misalignment in Arabic RTL mode

src/App.css

@@ -1990,3 +1990,12 @@ html[dir="rtl"] .chart-export-btn.visible {
   width: 100%;
   height: 100%;
 }
+
+/* Force LTR for chart canvas - fixes RTL label alignment issues */
+.chart-canvas-wrapper,
+.chart-canvas-wrapper canvas,
+.chart-container canvas,
+.exportable-chart canvas {
+  direction: ltr !important;
+  text-align: left !important;
+}