website refactor

apps/website/lib/display-objects/NumberDisplay.ts

@@ -0,0 +1,18 @@
+/**
+ * NumberDisplay
+ * 
+ * Deterministic number formatting for display.
+ * Avoids Intl and toLocaleString to prevent SSR/hydration mismatches.
+ */
+
+export class NumberDisplay {
+  /**
+   * Formats a number with thousands separators (commas).
+   * Example: 1234567 -> "1,234,567"
+   */
+  static format(value: number): string {
+    const parts = value.toString().split('.');
+    parts[0] = parts[0].replace(/\B(?=(\d{3})+(?!\d))/g, ',');
+    return parts.join('.');
+  }
+}