WIP: Cleans up ManualDClient and adds some more document strings.

Sources/ViewController/Views/DuctSizing/TrunkSizeForm.swift

@@ -67,7 +67,7 @@ struct TrunkSizeForm: HTML, Sendable {
             "Height",
             .type(.text),
             .name("height"),
-            .value(trunk?.height?.rawValue),
+            .value(trunk?.height),
             .placeholder("8 (Optional)"),
           )
         }

Sources/ViewController/Views/Project/ProjectView.swift

@@ -245,7 +245,7 @@ extension ManualDClient {
       .init(
         externalStaticPressure: staticPressure,
         componentPressureLosses: componentLosses,
-        totalEffectiveLength: Int(totalEquivalentLength)
+        totalEquivalentLength: Int(totalEquivalentLength)
       )
     )
   }