feat: add pull-to-refresh gesture to HomeScreen

Wrap HomeContent with PullToRefreshBox to allow refreshing library,
continue watching, and next up sections by pulling down. Also fix
refreshHomeData to suspend until loading completes so the refresh
indicator dismisses properly.

core/data/src/main/java/hu/bbara/purefin/core/data/InMemoryAppContentRepository.kt

@@ -297,15 +297,18 @@ class InMemoryAppContentRepository @Inject constructor(
         if (!isOnline) return
 
         if(loadJob?.isActive == true) {
+            loadJob?.join()
             return
         }
-        loadJob = scope.launch {
+        val job = scope.launch {
             loadLibraries()
             loadContinueWatching()
             loadNextUp()
             loadLatestLibraryContent()
             persistHomeCache()
         }
+        loadJob = job
+        job.join()
     }
 
     private suspend fun serverUrl(): String {