Move into mobile/

mobile/lib/ui/common/linear_progress_dialog.dart

@@ -0,0 +1,49 @@
+import 'package:flutter/material.dart';
+import 'package:photos/ente_theme_data.dart';
+
+class LinearProgressDialog extends StatefulWidget {
+  final String message;
+
+  const LinearProgressDialog(this.message, {Key? key}) : super(key: key);
+
+  @override
+  LinearProgressDialogState createState() => LinearProgressDialogState();
+}
+
+class LinearProgressDialogState extends State<LinearProgressDialog> {
+  double? _progress;
+
+  @override
+  void initState() {
+    _progress = 0;
+    super.initState();
+  }
+
+  void setProgress(double progress) {
+    setState(() {
+      _progress = progress;
+    });
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return WillPopScope(
+      onWillPop: () async => false,
+      child: AlertDialog(
+        title: Text(
+          widget.message,
+          style: const TextStyle(
+            fontSize: 16,
+          ),
+          textAlign: TextAlign.center,
+        ),
+        content: LinearProgressIndicator(
+          value: _progress,
+          valueColor: AlwaysStoppedAnimation<Color>(
+            Theme.of(context).colorScheme.greenAlternative,
+          ),
+        ),
+      ),
+    );
+  }
+}