fix(ui): improve cross-platform text input behavior (#1477)

ui/flutter/lib/app/app.dart

@@ -78,6 +78,7 @@ class _GopeedAppState extends ConsumerState<GopeedApp> with WidgetsBindingObserv
 
     return shad.ShadcnApp.router(
       debugShowCheckedModeBanner: false,
+      disableBrowserContextMenu: false,
       onGenerateTitle: (context) => context.l10n.appTitle,
       theme: AppTheme.light(themeColor),
       darkTheme: AppTheme.dark(themeColor),

ui/flutter/lib/features/auth/presentation/widgets/login_form.dart

@@ -6,6 +6,7 @@ import '../../../../l10n/l10n.dart';
 import '../../../../shared/theme/app_design_tokens.dart';
 import '../../../../shared/theme/app_palette.dart';
 import '../../../../shared/widgets/app_loading_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 
 class LoginForm extends StatelessWidget {
   const LoginForm({
@@ -159,7 +160,7 @@ class _LoginField extends StatelessWidget {
           style: TextStyle(color: palette.textPrimary, fontSize: 13, fontWeight: FontWeight.w600),
         ),
         const SizedBox(height: AppDesignTokens.space8),
-        shad.TextField(
+        AppTextField(
           key: fieldKey,
           controller: controller,
           focusNode: focusNode,

ui/flutter/lib/features/extensions/presentation/pages/extensions_page.dart

@@ -15,6 +15,7 @@ import '../../../../core/window/app_window_chrome.dart';
 import '../../../../shared/theme/app_design_tokens.dart';
 import '../../../../shared/theme/app_palette.dart';
 import '../../../../shared/widgets/app_primary_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../shared/widgets/app_tooltip.dart';
 import '../../../../shared/widgets/app_toast.dart';
 import '../../../../l10n/l10n.dart';
@@ -629,7 +630,7 @@ class _Toolbar extends StatelessWidget {
   Widget build(BuildContext context) {
     final palette = AppPalette.of(context);
     final manualInstallBusy = state.busyExtensionIds.contains(ExtensionsController.manualInstallBusyKey);
-    final search = shad.TextField(
+    final search = AppTextField(
       key: const ValueKey('extension-search-input'),
       controller: searchController,
       placeholder: Text(context.l10n.searchExtensions, style: TextStyle(color: palette.searchHint)),
@@ -826,7 +827,7 @@ class _InstallPopoverState extends State<_InstallPopover> {
             style: TextStyle(color: palette.textPrimary, fontSize: 13, fontWeight: FontWeight.w700),
           ),
           const SizedBox(height: 10),
-          shad.TextField(
+          AppTextField(
             key: const ValueKey('extension-install-url-input'),
             controller: widget.controller,
             autofocus: true,
@@ -1222,9 +1223,9 @@ class _ExtensionSettingField extends StatelessWidget {
         ],
         const SizedBox(height: 8),
         if (setting.type == api_extension.SettingType.boolean)
-          shad.TextField(controller: controller, placeholder: Text(context.l10n.booleanValueHint))
+          AppTextField(controller: controller, placeholder: Text(context.l10n.booleanValueHint))
         else
-          shad.TextField(
+          AppTextField(
             controller: controller,
             keyboardType: setting.type == api_extension.SettingType.number ? TextInputType.number : TextInputType.text,
           ),

ui/flutter/lib/features/home/presentation/widgets/tasks_top_bar.dart

@@ -5,6 +5,7 @@ import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
 import '../../../../shared/theme/app_design_tokens.dart';
 import '../../../../shared/theme/app_palette.dart';
 import '../../../../shared/widgets/app_primary_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../l10n/l10n.dart';
 
 class TasksTopBar extends StatelessWidget {
@@ -110,7 +111,7 @@ class _SearchField extends StatelessWidget {
       ),
       child: SizedBox(
         height: 40,
-        child: shad.TextField(
+        child: AppTextField(
           controller: controller,
           style: TextStyle(color: palette.textPrimary, fontSize: 14, height: 1),
           placeholder: Text(

ui/flutter/lib/features/settings/presentation/pages/settings_page.dart

@@ -24,6 +24,7 @@ import '../../../../shared/widgets/app_choice_segmented_control.dart';
 import '../../../../shared/widgets/app_loading_button.dart';
 import '../../../../shared/widgets/app_number_input.dart';
 import '../../../../shared/widgets/app_path_picker_field.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../shared/widgets/app_tooltip.dart';
 import '../../../../shared/widgets/app_toast.dart';
 import '../../../../shared/widgets/responsive_menu_layout.dart';
@@ -1849,7 +1850,7 @@ class _TextSettingControl extends StatelessWidget {
     final desktop = MediaQuery.sizeOf(context).width >= Breakpoints.mobile;
     return SizedBox(
       width: desktop ? AppDesignTokens.settingsFormControlWidth : double.infinity,
-      child: shad.TextField(
+      child: AppTextField(
         key: fieldKey,
         controller: controller,
         hintText: hintText,
@@ -1919,7 +1920,7 @@ class _HostPortControl extends StatelessWidget {
       child: Row(
         children: [
           Expanded(
-            child: shad.TextField(
+            child: AppTextField(
               key: hostKey,
               controller: hostController,
               hintText: context.l10n.server,

ui/flutter/lib/features/settings/presentation/widgets/download_categories_setting.dart

@@ -8,6 +8,7 @@ import '../../../../shared/theme/app_design_tokens.dart';
 import '../../../../shared/theme/app_palette.dart';
 import '../../../../shared/widgets/app_path_picker_field.dart';
 import '../../../../shared/widgets/app_primary_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../l10n/l10n.dart';
 
 class DownloadCategoryDraft {
@@ -169,7 +170,7 @@ Future<DownloadCategoryDraft?> showDownloadCategoryDialog(
               children: [
                 Text(dialogContext.l10n.categoryName, style: TextStyle(color: palette.textSecondary, fontSize: 12)),
                 const SizedBox(height: 6),
-                shad.TextField(key: const ValueKey('download-category-name'), controller: nameController),
+                AppTextField(key: const ValueKey('download-category-name'), controller: nameController),
                 const SizedBox(height: 14),
                 Text(dialogContext.l10n.categoryPath, style: TextStyle(color: palette.textSecondary, fontSize: 12)),
                 const SizedBox(height: 6),

ui/flutter/lib/features/settings/presentation/widgets/settings_list_editor.dart

@@ -9,6 +9,7 @@ import '../../../../shared/theme/app_palette.dart';
 import '../../../../shared/widgets/app_loading_button.dart';
 import '../../../../shared/widgets/app_path_picker_field.dart';
 import '../../../../shared/widgets/app_primary_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../l10n/l10n.dart';
 
 class SettingsListEntry {
@@ -189,7 +190,7 @@ Future<String?> showTextSettingDialog(
                 Text(fieldLabel, style: TextStyle(color: palette.textSecondary, fontSize: 12)),
                 const SizedBox(height: 6),
                 if (pickPath == null)
-                  shad.TextField(controller: controller)
+                  AppTextField(controller: controller)
                 else
                   AppPathPickerField(
                     controller: controller,
@@ -302,7 +303,7 @@ Future<GithubMirrorDraft?> showGithubMirrorDialog(BuildContext context, {GithubM
                 const SizedBox(height: 14),
                 Text(dialogContext.l10n.githubMirrorUrl, style: TextStyle(color: palette.textSecondary, fontSize: 12)),
                 const SizedBox(height: 6),
-                shad.TextField(controller: controller),
+                AppTextField(controller: controller),
                 if (validationMessage != null) ...[
                   const SizedBox(height: 8),
                   Text(validationMessage!, style: TextStyle(color: palette.error, fontSize: 12)),

ui/flutter/lib/features/tasks/presentation/pages/create_task_window_page.dart

@@ -32,6 +32,7 @@ import '../../../../shared/widgets/app_http_headers_editor.dart';
 import '../../../../shared/widgets/app_number_input.dart';
 import '../../../../shared/widgets/app_path_picker_field.dart';
 import '../../../../shared/widgets/app_primary_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../shared/widgets/app_tooltip.dart';
 import '../../../../shared/widgets/app_toast.dart';
 import '../../../../l10n/l10n.dart';
@@ -257,7 +258,12 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
     final page = Scaffold(
       backgroundColor: palette.sideBg,
       child: Padding(
-        padding: EdgeInsets.only(top: AppWindowChrome.reservesHeaderInset ? AppDesignTokens.windowHeaderHeight : 0),
+        key: const ValueKey('create-task-safe-content'),
+        padding: EdgeInsets.only(
+          top: AppWindowChrome.reservesHeaderInset
+              ? AppDesignTokens.windowHeaderHeight
+              : MediaQuery.paddingOf(context).top,
+        ),
         child: Column(
           children: [
             Container(
@@ -300,7 +306,7 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
                             children: [
                               SizedBox(
                                 height: 120,
-                                child: TextField(
+                                child: AppTextField(
                                   controller: _urlController,
                                   hintText: context.l10n.pasteDownloadLinks,
                                   keyboardType: TextInputType.multiline,
@@ -645,7 +651,7 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
                                 label: context.l10n.trackers,
                                 child: SizedBox(
                                   height: 96,
-                                  child: TextField(
+                                  child: AppTextField(
                                     controller: _trackersController,
                                     hintText: context.l10n.oneTrackerPerLine,
                                     keyboardType: TextInputType.multiline,
@@ -1233,7 +1239,7 @@ class _CreateTaskWindowPageState extends ConsumerState<CreateTaskWindowPage> {
                   children: [
                     SizedBox(
                       height: 38,
-                      child: TextField(
+                      child: AppTextField(
                         key: const ValueKey('create-history-filter'),
                         controller: filterController,
                         placeholder: Text(
@@ -1660,7 +1666,7 @@ class _WindowTextField extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final palette = AppPalette.of(context);
-    return TextField(
+    return AppTextField(
       controller: controller,
       hintText: hintText,
       keyboardType: keyboardType,

ui/flutter/lib/features/tasks/presentation/widgets/task_drawer.dart

@@ -9,6 +9,7 @@ import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
 import '../../../../shared/theme/app_design_tokens.dart';
 import '../../../../shared/theme/app_palette.dart';
 import '../../../../shared/widgets/app_copy_icon_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../shared/widgets/app_tooltip.dart';
 import '../../../../shared/widgets/detail/app_detail_surface.dart';
 import '../../../../core/utils/text_wrap.dart';
@@ -512,7 +513,7 @@ class _EditableUrlBlock extends StatelessWidget {
               children: [
                 SizedBox(
                   height: 76,
-                  child: shad.TextField(
+                  child: AppTextField(
                     controller: controller,
                     minLines: null,
                     maxLines: null,

ui/flutter/lib/features/tasks/presentation/widgets/task_update_url_dialog.dart

@@ -4,6 +4,7 @@ import 'package:shadcn_flutter/shadcn_flutter.dart' hide Column, Expanded, Row;
 import '../../../../shared/theme/app_palette.dart';
 import '../../../../shared/widgets/app_http_headers_editor.dart';
 import '../../../../shared/widgets/app_primary_button.dart';
+import '../../../../shared/widgets/app_text_field.dart';
 import '../../../../l10n/l10n.dart';
 import '../../domain/task_record.dart';
 
@@ -47,7 +48,7 @@ Future<TaskUrlUpdate?> showTaskUpdateUrlDialog(BuildContext context, TaskRecord
                   children: [
                     Text(dialogContext.l10n.downloadLink, style: TextStyle(color: palette.textPrimary, fontSize: 12)),
                     const SizedBox(height: 6),
-                    TextField(controller: urlController),
+                    AppTextField(controller: urlController),
                     const SizedBox(height: 18),
                     AppHttpHeadersEditor(
                       controller: headersController,

ui/flutter/lib/shared/widgets/app_http_headers_editor.dart

@@ -5,6 +5,7 @@ import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
 import '../theme/app_design_tokens.dart';
 import '../theme/app_palette.dart';
 import '../../l10n/l10n.dart';
+import 'app_text_field.dart';
 
 class AppHttpHeadersController extends ChangeNotifier {
   AppHttpHeadersController({Map<String, String>? headers, Iterable<String> defaultNames = const []}) {
@@ -171,7 +172,7 @@ class _HeaderTextField extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final palette = AppPalette.of(context);
-    return shad.TextField(
+    return AppTextField(
       controller: controller,
       hintText: hintText,
       filled: true,

ui/flutter/lib/shared/widgets/app_loading_button.dart

@@ -38,7 +38,7 @@ class AppLoadingButton extends StatelessWidget {
             children: [
               leading,
               const SizedBox(width: AppDesignTokens.space8),
-              effectiveChild,
+              Flexible(child: effectiveChild),
             ],
           );
     final effectiveOnPressed = loading ? null : onPressed;

ui/flutter/lib/shared/widgets/app_number_input.dart

@@ -2,6 +2,8 @@ import 'package:flutter/services.dart';
 import 'package:flutter/widgets.dart';
 import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
 
+import 'app_text_field.dart';
+
 /// A bounded numeric text field with the app's standard spinner controls.
 class AppNumberInput extends StatefulWidget {
   const AppNumberInput({
@@ -80,7 +82,7 @@ class _AppNumberInputState extends State<AppNumberInput> {
             FilteringTextInputFormatter.digitsOnly,
             _NumericalRangeFormatter(min: widget.min.toInt(), max: widget.max?.toInt()),
           ];
-    return shad.TextField(
+    return AppTextField(
       key: widget.fieldKey,
       controller: widget.controller,
       hintText: widget.hintText,

ui/flutter/lib/shared/widgets/app_path_picker_field.dart

@@ -4,6 +4,7 @@ import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
 
 import '../../core/utils/breakpoints.dart';
 import '../services/download_directory_picker.dart';
+import 'app_text_field.dart';
 import 'app_tooltip.dart';
 
 enum AppPathPickerButtonStyle { ghost, outline }
@@ -119,7 +120,7 @@ class _AppPathPickerFieldState extends State<AppPathPickerField> {
               onEnter: (_) => _syncTooltipPath(),
               child: AppTooltip(
                 message: _tooltipPath,
-                child: shad.TextField(
+                child: AppTextField(
                   key: widget.fieldKey,
                   controller: widget.controller,
                   hintText: widget.hintText,

ui/flutter/lib/shared/widgets/app_text_field.dart

@@ -0,0 +1,99 @@
+import 'package:flutter/material.dart' as material show AdaptiveTextSelectionToolbar;
+import 'package:flutter/widgets.dart';
+import 'package:shadcn_flutter/shadcn_flutter.dart' as shad;
+
+/// The app-wide text field.
+///
+/// shadcn_flutter's custom context menu is rendered in a full-screen overlay
+/// that can cover the app with an opaque surface. Use Flutter's adaptive
+/// platform toolbar everywhere so long-press and right-click text actions have
+/// consistent native behavior on mobile, desktop, and web.
+class AppTextField extends shad.TextField {
+  const AppTextField({
+    super.key,
+    super.groupId,
+    super.controller,
+    super.initialValue,
+    super.focusNode,
+    super.undoController,
+    super.decoration,
+    super.padding,
+    super.placeholder,
+    super.crossAxisAlignment,
+    super.clearButtonSemanticLabel,
+    super.keyboardType,
+    super.textInputAction,
+    super.textCapitalization,
+    super.style,
+    super.strutStyle,
+    super.textAlign,
+    super.textAlignVertical,
+    super.textDirection,
+    super.readOnly,
+    super.showCursor,
+    super.autofocus,
+    super.obscuringCharacter,
+    super.obscureText,
+    super.autocorrect,
+    super.smartDashesType,
+    super.smartQuotesType,
+    super.enableSuggestions,
+    super.maxLines,
+    super.minLines,
+    super.expands,
+    super.maxLength,
+    super.maxLengthEnforcement,
+    super.onChanged,
+    super.onEditingComplete,
+    super.onSubmitted,
+    super.onTapOutside,
+    super.onTapUpOutside,
+    super.inputFormatters,
+    super.enabled,
+    super.cursorWidth,
+    super.cursorHeight,
+    super.cursorRadius,
+    super.cursorOpacityAnimates,
+    super.cursorColor,
+    super.selectionHeightStyle,
+    super.selectionWidthStyle,
+    super.keyboardAppearance,
+    super.scrollPadding,
+    super.enableInteractiveSelection,
+    super.selectionControls,
+    super.dragStartBehavior,
+    super.scrollController,
+    super.scrollPhysics,
+    super.onTap,
+    super.autofillHints,
+    super.clipBehavior,
+    super.restorationId,
+    super.stylusHandwritingEnabled,
+    super.enableIMEPersonalizedLearning,
+    super.contentInsertionConfiguration,
+    super.contextMenuBuilder = appTextFieldContextMenuBuilder,
+    super.hintText,
+    super.border,
+    super.borderRadius,
+    super.filled,
+    super.statesController,
+    super.magnifierConfiguration,
+    super.spellCheckConfiguration,
+    super.features,
+    super.submitFormatters,
+    super.skipInputFeatureFocusTraversal,
+    super.onDragSelectionStart,
+    super.onDragSelectionUpdate,
+    super.onDragSelectionEnd,
+  });
+}
+
+Widget appTextFieldContextMenuBuilder(BuildContext context, EditableTextState editableTextState) {
+  // Match Flutter's platform text-menu policy without falling back to
+  // shadcn_flutter's full-screen overlay. EditableText bypasses this builder
+  // on Web while the browser context menu is enabled.
+  if (SystemContextMenu.isSupportedByField(editableTextState)) {
+    return SystemContextMenu.editableText(editableTextState: editableTextState);
+  }
+  return material.AdaptiveTextSelectionToolbar.editableText(editableTextState: editableTextState);
+}