Add scenario-modeler-server example

Demo MCP App for SaaS financial planning with:
- Interactive sliders for MRR, growth, churn, margin, and costs
- 12-month projection charts (MRR, Gross Profit, Net Profit)
- 5 pre-built scenario templates (Bootstrapped, VC Rocketship, etc.)
- Template comparison overlay for strategy analysis
- Light/dark theme support

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

examples/scenario-modeler-server/src/lib/formatters.ts

@@ -0,0 +1,44 @@
+/**
+ * Format a number as currency with abbreviated suffixes.
+ * Examples: $50K, $1.2M, -$30K
+ */
+export function formatCurrency(value: number): string {
+  const absValue = Math.abs(value);
+  const sign = value < 0 ? "-" : "";
+
+  if (absValue >= 1_000_000) {
+    const formatted = (absValue / 1_000_000).toFixed(
+      absValue >= 10_000_000 ? 1 : 2,
+    );
+    // Remove trailing zeros after decimal
+    const cleaned = formatted.replace(/\.?0+$/, "");
+    return `${sign}$${cleaned}M`;
+  }
+
+  if (absValue >= 1_000) {
+    const formatted = (absValue / 1_000).toFixed(absValue >= 100_000 ? 0 : 1);
+    const cleaned = formatted.replace(/\.?0+$/, "");
+    return `${sign}$${cleaned}K`;
+  }
+
+  return `${sign}$${Math.round(absValue)}`;
+}
+
+/**
+ * Format a number as a percentage.
+ * Examples: 5%, -2.5%, +12%
+ */
+export function formatPercent(value: number, showSign = false): string {
+  const sign = showSign && value > 0 ? "+" : "";
+  return `${sign}${value.toFixed(1).replace(/\.0$/, "")}%`;
+}
+
+/**
+ * Format currency for slider display (always show K suffix for consistency).
+ */
+export function formatCurrencySlider(value: number): string {
+  if (value >= 1_000) {
+    return `$${(value / 1_000).toFixed(0)}K`;
+  }
+  return `$${value}`;
+}