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.

feature/shared/src/main/java/hu/bbara/purefin/feature/shared/home/HomePageViewModel.kt

@@ -13,7 +13,10 @@ import hu.bbara.purefin.core.data.navigation.Route
 import hu.bbara.purefin.core.data.navigation.SeriesDto
 import hu.bbara.purefin.core.data.session.UserSessionRepository
 import hu.bbara.purefin.core.model.Media
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.StateFlow
+import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.stateIn
@@ -31,6 +34,9 @@ class HomePageViewModel @Inject constructor(
     private val refreshHomeDataUseCase: RefreshHomeDataUseCase
 ) : ViewModel() {
 
+    private val _isRefreshing = MutableStateFlow(false)
+    val isRefreshing: StateFlow<Boolean> = _isRefreshing.asStateFlow()
+
     private val _url = userSessionRepository.serverUrl.stateIn(
         scope = viewModelScope,
         started = SharingStarted.Eagerly,
@@ -195,6 +201,19 @@ class HomePageViewModel @Inject constructor(
         }
     }
 
+    fun onRefresh() {
+        viewModelScope.launch {
+            _isRefreshing.value = true
+            try {
+                refreshHomeDataUseCase()
+            } catch (e: Exception) {
+                // Refresh is best-effort; don't crash on failure
+            } finally {
+                _isRefreshing.value = false
+            }
+        }
+    }
+
     fun logout() {
         viewModelScope.launch {
             userSessionRepository.setLoggedIn(false)