refactor: hoist state out of UserProfile

Solves the issue of every pop of the backstack causing data to be re-fetched,
but now has the issue of the data being stale for a few frames. Still better
than the current state, so I'll take it.

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/screens/LobstersPostsScreen.kt

@@ -222,7 +222,6 @@ fun LobstersPostsScreen(
           ) { dest ->
             UserProfile(
               username = dest.username,
-              getProfile = viewModel::getUserProfile,
               contentPadding = contentPadding,
               openUserProfile = { clawBackStack.add(User(it)) },
             )

android/src/main/kotlin/dev/msfjarvis/claw/android/viewmodel/ClawViewModel.kt

@@ -161,17 +161,6 @@ constructor(
   suspend fun getLinkMetadata(url: String) =
     withContext(ioDispatcher) { linkMetadataRepository.getLinkMetadata(url) }
 
-  suspend fun getUserProfile(username: String) =
-    withContext(ioDispatcher) {
-      when (val result = api.getUser(username)) {
-        is Success -> result.value
-        is Failure.NetworkFailure -> throw result.error
-        is Failure.UnknownFailure -> throw result.error
-        is Failure.HttpFailure -> throw result.toError()
-        is Failure.ApiFailure -> throw IOException("API returned an invalid response")
-      }
-    }
-
   suspend fun importPosts(input: InputStream) = dataTransferRepository.importPosts(input)
 
   suspend fun exportPostsAsJson(output: OutputStream) =