Merge PR #1505: emphasize task creation and empty-list actions

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

@@ -0,0 +1,32 @@
+import 'package:flutter/material.dart' show Icons;
+import 'package:flutter/widgets.dart';
+
+import '../../../../l10n/l10n.dart';
+import '../../../../shared/theme/app_design_tokens.dart';
+import '../../../../shared/widgets/app_primary_button.dart';
+
+/// Shared creation action for task headers and empty-list guidance.
+class TaskCreateButton extends StatelessWidget {
+  const TaskCreateButton({super.key, required this.onPressed, this.minHeight = 0});
+
+  final VoidCallback onPressed;
+  final double minHeight;
+
+  @override
+  Widget build(BuildContext context) {
+    return ConstrainedBox(
+      constraints: BoxConstraints(minHeight: minHeight),
+      child: AppPrimaryButton(
+        onPressed: onPressed,
+        child: Row(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            const Icon(Icons.add),
+            const SizedBox(width: AppDesignTokens.space8),
+            Flexible(child: Text(context.l10n.create, maxLines: 1, overflow: TextOverflow.ellipsis)),
+          ],
+        ),
+      ),
+    );
+  }
+}

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

@@ -1,35 +1,49 @@
 import 'package:flutter/widgets.dart';
 
 import '../../../../shared/theme/app_palette.dart';
+import '../../../../shared/theme/app_design_tokens.dart';
+import 'task_create_button.dart';
 import '../../../../l10n/l10n.dart';
 
 class TaskEmptyState extends StatelessWidget {
-  const TaskEmptyState({super.key, this.message});
+  const TaskEmptyState({super.key, this.message, this.onCreateTask});
 
   final String? message;
+  final VoidCallback? onCreateTask;
 
   @override
   Widget build(BuildContext context) {
     final palette = AppPalette.of(context);
     return Center(
-      child: ConstrainedBox(
-        constraints: const BoxConstraints(maxWidth: 360),
-        child: Padding(
-          padding: const EdgeInsets.all(24),
-          child: Column(
-            mainAxisSize: MainAxisSize.min,
-            children: [
-              CustomPaint(
-                key: const ValueKey('task-empty-illustration'),
-                size: const Size(148, 108),
-                painter: _TaskEmptyIllustrationPainter(palette: palette),
-              ),
-              const SizedBox(height: 18),
-              Text(
-                message ?? context.l10n.emptyTaskList,
-                style: TextStyle(color: palette.textPrimary, fontSize: 17, fontWeight: FontWeight.w700),
-              ),
-            ],
+      child: SingleChildScrollView(
+        child: ConstrainedBox(
+          constraints: const BoxConstraints(maxWidth: 360),
+          child: Padding(
+            padding: const EdgeInsets.all(24),
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              children: [
+                CustomPaint(
+                  key: const ValueKey('task-empty-illustration'),
+                  size: const Size(148, 108),
+                  painter: _TaskEmptyIllustrationPainter(palette: palette),
+                ),
+                const SizedBox(height: 18),
+                Text(
+                  message ?? context.l10n.emptyTaskList,
+                  textAlign: TextAlign.center,
+                  style: TextStyle(color: palette.textPrimary, fontSize: 17, fontWeight: FontWeight.w700),
+                ),
+                if (onCreateTask != null) ...[
+                  const SizedBox(height: AppDesignTokens.space24),
+                  TaskCreateButton(
+                    key: const ValueKey('tasks-empty-create-button'),
+                    onPressed: onCreateTask!,
+                    minHeight: 48,
+                  ),
+                ],
+              ],
+            ),
           ),
         ),
       ),