extensions: Move empty paging flow function to extensions package

This is unrelated with previews

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/java/com/aurora/extensions/Paging.kt

@@ -0,0 +1,20 @@
+/*
+ * SPDX-FileCopyrightText: 2025 The Calyx Institute
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+package com.aurora.extensions
+
+import androidx.compose.runtime.Composable
+import androidx.paging.PagingData
+import androidx.paging.compose.LazyPagingItems
+import androidx.paging.compose.collectAsLazyPagingItems
+import kotlinx.coroutines.flow.flowOf
+
+/**
+ * Empty lazy paging item flow for optional methods
+ */
+@Composable
+fun <T: Any> emptyPagingItems(): LazyPagingItems<T> {
+    return flowOf(PagingData.empty<T>()).collectAsLazyPagingItems()
+}