fix: login/signup flow working with session-based auth

- Fixed hashPasswordIO to use real PBKDF2 hashing from Sis.Auth
- Added seed route (rseed) for demo data initialization
- Replaced redirect() in update functions with success views
  (redirect uses throwError_ which broke with effectful 2.4)
- Added loginSuccessView and signupSuccessView with dashboard links
- Patched Hyperbole Socket.hs to parse WebSocket form body into Form params
- Patched Hyperbole Wai.hs to include TargetViewId in response metadata
- Fixed View/Page type mismatches (hyper wrapper vs plain view)
- Removed dead pure after redirect calls
- Verified: login submits, session set, success view rendered

app/Main.hs

@@ -5,16 +5,16 @@
 
 module Main where
 
-import Data.ByteString.Char8 qualified as C8
 import Data.ByteString qualified as BS
+import Data.ByteString.Char8 qualified as C8
 import Data.ByteString.Lazy qualified as BL
+import Data.List (isSuffixOf)
 import Effectful
 import Network.HTTP.Types qualified as HTTP
 import Network.Wai qualified as Wai
 import Network.Wai.Handler.Warp qualified as Warp
 import System.Directory (createDirectoryIfMissing, doesFileExist)
 import System.FilePath (takeDirectory)
-import Data.List (isSuffixOf)
 
 import Sis.Database
 import Sis.Page.Activity
@@ -88,3 +88,6 @@ router RDashboard = runPage Sis.Page.Dashboard.page
 router RChores = runPage Sis.Page.Chores.page
 router RHousehold = runPage Sis.Page.Household.page
 router RActivity = runPage Sis.Page.Activity.page
+router RSeed = do
+    seed
+    redirect (routeUri RDashboard)