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

app/lib/presentation/reader/address_bar.dart

@@ -0,0 +1,80 @@
+import 'package:flutter/material.dart';
+import 'package:signals/signals_flutter.dart' show SignalBuilder;
+
+import '../app.dart';
+
+/// The single-field address bar at the top of the reader. Submitting navigates;
+/// the field shows the current page's URL whenever the reader is not typing.
+class AddressBar extends StatefulWidget {
+  const AddressBar({super.key});
+
+  @override
+  State<AddressBar> createState() => _AddressBarState();
+}
+
+class _AddressBarState extends State<AddressBar> {
+  final _controller = TextEditingController();
+  final _focus = FocusNode();
+  bool _focused = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _focus.addListener(() {
+      if (_focus.hasFocus != _focused) {
+        setState(() => _focused = _focus.hasFocus);
+        if (_focused) {
+          _controller.selection =
+              TextSelection(baseOffset: 0, extentOffset: _controller.text.length);
+        }
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _focus.dispose();
+    _controller.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final deps = AppScope.of(context).deps;
+    final strings = AppScope.of(context).strings;
+
+    return SignalBuilder(builder: (context) {
+      final url = deps.browser.currentPage.value?.url;
+      if (url != null && !_focused) {
+        _controller.text = url;
+      }
+      return Padding(
+        padding: const EdgeInsets.fromLTRB(8, 8, 8, 4),
+        child: TextField(
+          controller: _controller,
+          focusNode: _focus,
+          autofocus: false,
+          keyboardType: TextInputType.url,
+          textInputAction: TextInputAction.go,
+          autocorrect: false,
+          enableSuggestions: false,
+          onSubmitted: (value) {
+            _focus.unfocus();
+            deps.browser.open(value);
+          },
+          decoration: InputDecoration(
+            hintText: strings.t('reader-address-placeholder'),
+            labelText: strings.t('reader-address-label'),
+            prefixIcon: IconButton(
+              icon: const Icon(Icons.refresh),
+              tooltip: strings.t('reader-reload'),
+              onPressed: () => deps.browser.reload(),
+            ),
+            isDense: true,
+            border: const OutlineInputBorder(),
+          ),
+        ),
+      );
+    });
+  }
+}