Better client/login/authState handling

flutter/lib/components/hidable_fab/hidable_fab.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+class HidableFAB extends StatelessWidget {
+  final VoidCallback? onPressed;
+  final IconData icon;
+
+  const HidableFAB({
+    super.key,
+    this.onPressed,
+    required this.icon,
+  });
+
+  Widget build(BuildContext context) {
+    return Visibility(
+      visible: MediaQuery.viewInsetsOf(context).bottom == 0.0, // hide when keyboard is shown
+      child: FloatingActionButton(
+        onPressed: onPressed,
+        shape: const RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(17))),
+        elevation: 2.0,
+        child: Icon(icon),
+      ),
+    );
+  }
+}