Add LoadingOrError component

app/src/main/kotlin/it/vfsfitvnm/vimusic/ui/components/themed/LoadingOrError.kt

@@ -0,0 +1,41 @@
+package it.vfsfitvnm.vimusic.ui.components.themed
+
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.ColumnScope
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
+import com.valentinilk.shimmer.shimmer
+import it.vfsfitvnm.vimusic.R
+
+@Composable
+fun LoadingOrError(
+    errorMessage: String? = null,
+    onRetry: (() -> Unit)? = null,
+    horizontalAlignment: Alignment.Horizontal = Alignment.Start,
+    loadingContent: @Composable ColumnScope.() -> Unit
+) {
+    Box {
+        Column(
+            horizontalAlignment = horizontalAlignment,
+            modifier = Modifier
+                .alpha(if (errorMessage == null) 1f else 0f)
+                .shimmer(),
+            content = loadingContent
+        )
+
+        errorMessage?.let {
+            TextCard(
+                icon = R.drawable.alert_circle,
+                onClick = onRetry,
+                modifier = Modifier
+                    .align(Alignment.Center)
+            ) {
+                Title(text = onRetry?.let { "Tap to retry" } ?: "Error")
+                Text(text = "An error has occurred:\n$errorMessage")
+            }
+        }
+    }
+}