feat: Begins hvac system performance

Sources/ViewController/Views/HVACSystemPerformance.swift

@@ -0,0 +1,62 @@
+import Elementary
+import ElementaryHTMX
+import Routes
+import Styleguide
+
+struct HVACSystemPerformanceForm: HTML, Sendable {
+
+  var content: some HTML {
+    FormHeader(label: "HVAC System Performance", svg: .thermometerSun)
+    form(
+      // Using index to get the correct path, but really uses the `submit` end-point.
+      .hx.post(route: .hvacSystemPerformance(.index)),
+      .hx.target("#result")
+    ) {
+      div(.class("space-y-6")) {
+        div(.class("grid grid-cols-1 md:grid-cols-3 gap-4")) {
+          LabeledContent(label: "System Size (Tons)") {
+            Input(id: "systemSize", placeholder: "System size")
+              .attributes(.type(.number), .min("1"), .step("0.5"), .autofocus, .required)
+          }
+          LabeledContent(label: "Airflow (CFM)") {
+            Input(id: "airflow", placeholder: "Airflow")
+              .attributes(.type(.number), .min("1"), .step("0.5"), .required)
+          }
+          LabeledContent(label: "Altitude (ft.)") {
+            Input(id: "altitude", placeholder: "Altitude (Optional)")
+              .attributes(.type(.number), .min("1"), .step("0.5"))
+          }
+        }
+
+        div(.class("grid grid-cols-1 md:grid-cols-2 gap-4")) {
+          div(.class("space-y-4")) {
+            h3(.class("text-lg font-medium")) { "Return Air" }
+            LabeledContent(label: "Dry Bulb (°F)") {
+              Input(id: "returnAirTemperature", placeholder: "Return temperature")
+            }
+            LabeledContent(label: "Indoor Humdity (%)") {
+              Input(id: "returnAirHumidity", placeholder: "Return humidity")
+                .attributes(.type(.number), .step("0.1"), .min("0.1"), .required)
+            }
+          }
+          div(.class("space-y-4")) {
+            h3(.class("text-lg font-medium")) { "Supply Air" }
+            LabeledContent(label: "Dry Bulb (°F)") {
+              Input(id: "supplyAirTemperature", placeholder: "Supply temperature")
+            }
+            LabeledContent(label: "Indoor Humdity (%)") {
+              Input(id: "supplyAirHumidity", placeholder: "Supply humidity")
+                .attributes(.type(.number), .step("0.1"), .min("0.1"), .required)
+            }
+          }
+        }
+        div {
+          SubmitButton(label: "Calculate Performance")
+        }
+      }
+    }
+    div(.id("result")) {}
+  }
+}
+
+struct HVACSystemPerformanceResult: HTML, Sendable {}