Support multiple file formats for upload

app/src/main/java/com/duckai/app/web/MainActivity.kt

@@ -112,7 +112,34 @@ class MainActivity : AppCompatActivity() {
     }
 
     private fun openFilePicker() {
-        filePickerLauncher.launch(arrayOf("application/pdf"))
+        val mimeTypes = arrayOf(
+            "text/plain",
+            "text/markdown",
+            "text/csv",
+            "application/pdf",
+            "application/msword",
+            "application/vnd.openxmlformats-officedocument.wordprocessingml.document",
+            "application/rtf",
+            "application/vnd.ms-excel",
+            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
+            "application/vnd.oasis.opendocument.spreadsheet",
+            "application/vnd.ms-powerpoint",
+            "application/vnd.openxmlformats-officedocument.presentationml.presentation",
+            "image/png",
+            "image/jpeg",
+            "image/webp",
+            "image/gif",
+            "application/x-python",
+            "application/javascript",
+            "application/java",
+            "application/json",
+            "application/xml",
+            "text/yaml",
+            "text/html",
+            "text/css",
+            "application/zip"
+        )
+        filePickerLauncher.launch(mimeTypes)
     }
 
     private fun loadUrlFromIntent() {