Component

Add:
- upload button : masih percobaan

Utils:
Add:
- file validasi untuk upload file

Pakage
Add:
- expo-document-picker
- expo-file-system

## No Issue

utils/fileValidation.ts

@@ -0,0 +1,34 @@
+// utils/fileValidation.ts
+const ALLOWED_TYPES: Record<string, string[]> = {
+  image: ["jpeg", "jpg", "png"],
+  document: ["pdf", "png"],
+  pdf: ["pdf"],
+  png: ["png"],
+};
+
+export const isValidFileType = (
+  fileName: string,
+  allowedExtensions: string[]
+): boolean => {
+  const extension = fileName.split(".").pop()?.toLowerCase();
+  return !!extension && allowedExtensions.includes(extension);
+};
+
+// Helper: Dapatkan MIME type berdasarkan ekstensi (opsional)
+export const getMimeType = (fileName: string): string => {
+  const ext = fileName.split(".").pop()?.toLowerCase();
+  switch (ext) {
+    case "jpg":
+      return "image/jpg";
+    case "jpeg":
+      return "image/jpeg";
+    case "png":
+      return "image/png";
+    case "pdf":
+      return "application/pdf";
+    default:
+      return "application/octet-stream";
+  }
+};
+
+export default ALLOWED_TYPES;