feat: Initial filter pressure drop views, calculations need implemented.

Sources/ViewController/HomePage.swift

@@ -43,6 +43,12 @@ struct HomePage: HTML, Sendable {
         svg: .zap,
         route: .capacitor(.index)
       )
+      group(
+        label: "Filter Pressure Drop",
+        description: FilterPressureDrop.description,
+        svg: .funnel,
+        route: .filterPressureDrop(.index)
+      )
     }
   }
 
@@ -53,8 +59,7 @@ struct HomePage: HTML, Sendable {
     route: SiteRoute.View
   ) -> some HTML {
     button(
-      .hx.get(route: route),
-      .hx.target("#content"),
+      .hx.get(route: route), .hx.target("#content"), .hx.pushURL(true),
       .class("""
       w-full rounded-xl shadow-lg border border-blue-600 justify-items-start
       hover:bg-blue-600 hover:border-yellow-300 hover:text-yellow-300 transition-colors