feat: build v1 Mews client: reader UI, gestures, Drift store, fetch actor

app/lib/presentation/reader/fob.dart

@@ -0,0 +1,34 @@
+import 'package:flutter/material.dart';
+
+/// The floating control that appears when the reader scrolls, opening the
+/// reader settings bottom sheet.
+class Fob extends StatelessWidget {
+  const Fob({required this.visible, required this.label, required this.onTap, super.key});
+
+  final bool visible;
+  final String label;
+  final VoidCallback onTap;
+
+  @override
+  Widget build(BuildContext context) {
+    return AnimatedOpacity(
+      opacity: visible ? 1 : 0,
+      duration: const Duration(milliseconds: 200),
+      curve: Curves.easeOut,
+      child: IgnorePointer(
+        ignoring: !visible,
+        child: Padding(
+          padding: const EdgeInsets.all(16),
+          child: Semantics(
+            label: label,
+            button: true,
+            child: FloatingActionButton(
+              onPressed: onTap,
+              child: const Icon(Icons.tune),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}