feat: Finishes filter pressure drop calculator

Sources/ViewController/HomePage.swift

@@ -44,7 +44,7 @@ struct HomePage: HTML, Sendable {
         route: .capacitor(.index)
       )
       group(
-        label: "Filter Pressure Drop",
+        label: "Filter Sizing",
         description: FilterPressureDrop.description,
         svg: .funnel,
         route: .filterPressureDrop(.index)

Sources/ViewController/Live.swift

@@ -103,15 +103,10 @@ extension ViewController: DependencyKey {
       case let .filterPressureDrop(route):
         switch route {
         case let .index(mode: mode):
-          // FIX: remove response.
-          #if DEBUG
-            return request.respond(FilterPressureDropForm(mode: mode, response: .mock(mode: mode ?? .basic)))
-          #else
-            return request.respond(FilterPressureDropForm(mode: mode, response: nil))
-          #endif
-        case .submit:
-          // FIX: implement.
-          fatalError()
+          return request.respond(FilterPressureDropForm(mode: mode, response: nil))
+        case let .submit(request):
+          let response = try await request.respond(logger: logger)
+          return FilterPressureDropResponse(response: response)
         }
 
       case let .hvacSystemPerformance(route):

Sources/ViewController/Views/FilterPressureDrop.swift

@@ -25,9 +25,6 @@ struct FilterPressureDropForm: HTML, Sendable {
       .attributes(.class("mb-6"))
     }
 
-    // FIX: Remove when done.
-    WarningBox("This is under construction and does not work currently.")
-
     form(
       .hx.post(route: .filterPressureDrop(.index)),
       .hx.target("#result")
@@ -41,8 +38,6 @@ struct FilterPressureDropForm: HTML, Sendable {
         }
         div {
           SubmitButton(label: "Calculate Pressure Drop")
-            // FIX: Remove when done.
-            .attributes(.disabled)
         }
       }
     }
@@ -127,7 +122,7 @@ struct FilterPressureDropForm: HTML, Sendable {
                 .attributes(.type(.number), .step("0.1"), .min("0.1"), .required)
             }
             LabeledContent(label: "Filter Pressure Drop: (in. w.c.)") {
-              Input(id: "ratedPressure", placeholder: "Rated or measured pressure drop")
+              Input(id: "ratedPressureDrop", placeholder: "Rated or measured pressure drop")
                 .attributes(.type(.number), .step("0.1"), .min("0.1"), .required)
             }
             LabeledContent(label: "Design Airflow: (CFM)") {