upd: loading overlay

Deskripsi:
- update loading saat aksi tambah dan edit pada fitur pengumuman, diskusi umum dan diskusi divisi

No Issues

components/loadingOverlay.tsx

@@ -0,0 +1,50 @@
+import React from "react";
+import { View, ActivityIndicator, StyleSheet, Text } from "react-native";
+
+type Props = {
+  visible: boolean;
+  text?: string;
+};
+
+export default function LoadingOverlay({
+  visible,
+  text = "Loading...",
+}: Props) {
+  if (!visible) return null;
+
+  return (
+    <View style={styles.overlay}>
+      <View style={styles.box}>
+        <ActivityIndicator size="small" color="#2c3e50" />
+        <Text style={styles.text}>{text}</Text>
+      </View>
+    </View>
+  );
+}
+
+const styles = StyleSheet.create({
+  overlay: {
+    ...StyleSheet.absoluteFillObject,
+    backgroundColor: "rgba(0,0,0,0.35)",
+    justifyContent: "center",
+    alignItems: "center",
+    zIndex: 9999,
+  },
+  box: {
+    paddingVertical: 5,
+    paddingHorizontal: 15,
+    backgroundColor: "#fff",
+    borderRadius: 8,
+    alignItems: "center",
+    elevation: 6, // Android
+    shadowColor: "#000", // iOS
+    shadowOpacity: 0.25,
+    shadowRadius: 5,
+    shadowOffset: { width: 0, height: 4 },
+  },
+  text: {
+    marginTop: 5,
+    fontSize: 14,
+    color: "#2c3e50",
+  },
+});