frontend-app-api: internalize prepared session state

Move prepared app session ownership into frontend-app-api so bootstrap only signals readiness while callers use tryFinalize or finalize to read the finalized app state. This reduces createApp boilerplate and keeps the specialized app lifecycle centered in the lower-level API.

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>
Made-with: Cursor

packages/frontend-app-api/src/wiring/index.ts

@@ -15,8 +15,11 @@
  */
 
 export {
+  type FinalizedSpecializedApp,
   prepareSpecializedApp,
   type PreparedSpecializedApp,
+  type PreparedSpecializedAppSignInProps,
+  type SpecializedAppSessionState,
   createSpecializedApp,
   type CreateSpecializedAppOptions,
 } from './createSpecializedApp';