add new collection page

frontend/app/Page/NewCollection.hs

@@ -0,0 +1,44 @@
+module Page.NewCollection
+  ( Model,
+    initialModel,
+    Action,
+    updateModel,
+    viewModel,
+  )
+where
+
+import Data.Text qualified as T
+import Form qualified as F
+import Miso
+
+data Model = Model
+  { input :: T.Text
+  }
+  deriving (Show, Eq)
+
+initialModel :: JSM (Either String Model)
+initialModel = do
+  pure (Right (Model {input = ""}))
+
+data Action
+  = NoOp
+  | FormChanged T.Text
+  | FormSubmitted T.Text
+  deriving (Eq, Show)
+
+updateModel :: Action -> Model -> Effect Action Model
+updateModel NoOp m = noEff m
+updateModel (FormChanged input) m = noEff m {input}
+updateModel (FormSubmitted _) m = noEff m
+
+viewModel :: Model -> View Action
+viewModel m = do
+  div_ [] $
+    [ h3_ [] [text "new collection"],
+      either FormChanged FormSubmitted
+        <$> F.runForm collectionForm m.input
+    ]
+
+collectionForm :: F.Form T.Text T.Text
+collectionForm =
+  F.input "name"