fix(index): update imports for usePrefetch and useRemember

Change imports of usePrefetch and useRemember to reference their .svelte files directly. This ensures correct module resolution and compatibility with Svelte's file conventions.

Author: brodienguyen

packages/svelte5/src/index.ts

@@ -9,5 +9,5 @@ export { default as page } from './page'
 export { type ResolvedComponent } from './types'
 export { default as useForm, type InertiaForm, type InertiaFormProps } from './useForm'
 export { default as usePoll } from './usePoll'
-export { default as usePrefetch } from './usePrefetch'
-export { default as useRemember } from './useRemember'
+export { default as usePrefetch } from './usePrefetch.svelte'
+export { default as useRemember } from './useRemember.svelte'