feat: add import form and result page templates

src/Roux/Html.hs

@@ -9,6 +9,9 @@ so name-shadowing is unavoidable with local bindings.
 -}
 module Roux.Html (
     SortMode (..),
+    ImportError (..),
+    importPage,
+    importResultPage,
     indexPage,
     recipePage,
     urlEncode,
@@ -45,6 +48,10 @@ data SortMode
     | CourseSort
     deriving stock (Eq, Show)
 
+-- | Error type for the import pipeline.
+data ImportError = ImportError Text
+    deriving stock (Eq, Show)
+
 -- ---------------------------------------------------------------------------
 -- Helpers used throughout
 -- ---------------------------------------------------------------------------
@@ -406,6 +413,41 @@ indexPage _mode recipes =
     filterOk = filter (isRight . Idx.riRecipe)
     filterBad = filter (isLeft . Idx.riRecipe)
 
+-- ---------------------------------------------------------------------------
+-- Import page (form + result)
+-- ---------------------------------------------------------------------------
+
+-- | Render the import form page, optionally with a validation error.
+importPage :: Maybe Text -> ByteString
+importPage merror =
+    page "Roux \8212 Import Recipe" $ do
+        H.div ! A.class_ "roux-navbar" $ do
+            H.ul $ H.li $ H.a ! A.href "/" $ "\8592 Back"
+            H.ul $ H.li $ H.strong "Import Recipe"
+        case merror of
+            Just err -> H.p ! A.style "color: var(--roux-accent);" $ H.toHtml err
+            Nothing -> pure ()
+        H.form ! A.method "POST" ! A.action "/import" $ do
+            H.label ! A.for "url" $ "Recipe URL"
+            H.input
+                ! A.type_ "url"
+                ! A.id "url"
+                ! A.name "url"
+                ! A.placeholder "https://cooking.nytimes.com/recipes/..."
+                ! A.required ""
+                ! A.style "width: 100%; margin-bottom: 1rem;"
+            H.button ! A.type_ "submit" $ "Import Recipe"
+
+-- | Render the import result page with an error message.
+importResultPage :: ImportError -> ByteString
+importResultPage (ImportError msg) =
+    page "Roux \8212 Import Error" $ do
+        H.div ! A.class_ "roux-navbar" $ do
+            H.ul $ H.li $ H.a ! A.href "/" $ "\8592 Back"
+            H.ul $ H.li $ H.a ! A.href "/import" $ "Try again"
+        H.h2 "Import failed"
+        H.p $ H.toHtml msg
+
 recipePage :: Idx.RecipeInfo -> ByteString
 recipePage info =
     case Idx.riRecipe info of