feat: Begins thermal balance point

Sources/ViewController/HomePage.swift

@@ -49,6 +49,12 @@ struct HomePage: HTML, Sendable {
         svg: .funnel,
         route: .filterPressureDrop(.index)
       )
+      group(
+        label: "Heating Balance Point",
+        description: HeatingBalancePoint.description,
+        svg: .scale,
+        route: .heatingBalancePoint(.index)
+      )
     }
   }