Replace Recharts charts with custom SVG components

- Lead status: custom SVG donut with radial gradients, hover effects, percentage tooltips
- Leads per month: custom SVG grouped bar chart with hover dimming, gradient bars
- Tooltip colors fixed to use theme variables
- Right-panel lead status icon colors updated

src/data/dashboard.ts

@@ -32,7 +32,7 @@ function getStatusDistribution() {
     { name: "Contacted", value: statusCounts.contacted, color: "#f59e0b" },
     { name: "Pending", value: statusCounts.pending, color: "#8b5cf6" },
     { name: "Closed", value: statusCounts.closed, color: "#10b981" },
-    { name: "Ignored", value: statusCounts.ignored, color: "#71717a" },
+    { name: "Ignored", value: statusCounts.ignored, color: "#6B7280" },
   ]
 }