fix: rename route constructors to avoid type conflicts

- Renamed route constructors: RouteLogin → RLogin, RouteDashboard → RDashboard, etc.
- This fixes ambiguous occurrence errors with Types.Dashboard vs Route.Dashboard
- Fixed Layout.hs navbar links to use new constructor names
- Server verified serving HTML on /login, /rdashboard, etc.

src/Sis/Page/Activity.hs

@@ -89,7 +89,7 @@ page = do
     mSession <- lookupSession @UserSession
     case mSession of
         Nothing -> do
-            redirect (routeUri RouteLogin)
+            redirect (routeUri RLogin)
             pure $ hyper ActivityPage $ el "Redirecting..."
         Just us -> do
             hhs <- getUserHouseholds (UserId (usUserId us))