M3 Overhaul

lib/screens/tasks/task_detail_screen.dart

@@ -1,5 +1,6 @@
 // ignore_for_file: use_build_context_synchronously
 import 'package:flutter/material.dart';
+import '../../theme/m3_motion.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 
@@ -1919,7 +1920,7 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
                                                               onPressed: () async {
                                                                 final urlCtrl =
                                                                     TextEditingController();
-                                                                final res = await showDialog<String?>(
+                                                                final res = await m3ShowDialog<String?>(
                                                                   context:
                                                                       context,
                                                                   builder: (ctx) => AlertDialog(
@@ -2234,7 +2235,7 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
                                                                 onPressed: () async {
                                                                   final urlCtrl =
                                                                       TextEditingController();
-                                                                  final res = await showDialog<String?>(
+                                                                  final res = await m3ShowDialog<String?>(
                                                                     context:
                                                                         context,
                                                                     builder: (ctx) => AlertDialog(
@@ -2848,7 +2849,8 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
                               child: SizedBox(
                                 width: 280,
                                 child: Card(
-                                  elevation: 4,
+                                  elevation: 0,
+                                  shadowColor: Colors.transparent,
                                   child: Padding(
                                     padding: const EdgeInsets.all(12.0),
                                     child: Row(
@@ -3779,7 +3781,7 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
     Timer? titleTypingTimer;
 
     try {
-      await showDialog<void>(
+      await m3ShowDialog<void>(
         context: context,
         builder: (dialogContext) {
           var saving = false;
@@ -3999,7 +4001,7 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
                         : () => Navigator.of(dialogContext).pop(),
                     child: const Text('Cancel'),
                   ),
-                  ElevatedButton(
+                  FilledButton(
                     onPressed: saving
                         ? null
                         : () async {
@@ -4174,7 +4176,7 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
         // If cancelling, require a reason — show dialog with spinner.
         if (value == 'cancelled') {
           final reasonCtrl = TextEditingController();
-          await showDialog<void>(
+          await m3ShowDialog<void>(
             context: context,
             builder: (dialogContext) {
               var isSaving = false;
@@ -4399,7 +4401,7 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
       if (!mounted) return;
 
       // Show loading dialog
-      showDialog(
+      m3ShowDialog(
         context: context,
         barrierDismissible: false,
         builder: (BuildContext dialogContext) {
@@ -4543,7 +4545,7 @@ class _TaskDetailScreenState extends ConsumerState<TaskDetailScreen>
 
   Future<void> _deleteTaskAttachment(String taskId, String fileName) async {
     try {
-      final confirmed = await showDialog<bool>(
+      final confirmed = await m3ShowDialog<bool>(
         context: context,
         builder: (ctx) => AlertDialog(
           title: const Text('Delete Attachment?'),

lib/screens/tasks/task_pdf.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'dart:typed_data';
 
 import 'package:flutter/material.dart';
+import '../../theme/m3_motion.dart';
 import 'package:flutter/services.dart' show rootBundle;
 import 'package:flutter_quill/flutter_quill.dart' as quill;
 import 'package:pdf/widgets.dart' as pw;
@@ -495,7 +496,7 @@ Future<void> showTaskPdfPreview(
   List<TaskAssignment> assignments,
   List<Profile> profiles,
 ) async {
-  await showDialog<void>(
+  await m3ShowDialog<void>(
     context: context,
     builder: (ctx) => TaskPdfDialog(
       task: task,

lib/screens/tasks/tasks_list_screen.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 
 import 'package:flutter/material.dart';
+import '../../theme/m3_motion.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:flutter_typeahead/flutter_typeahead.dart';
@@ -554,7 +555,7 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen>
             right: 16,
             bottom: 16,
             child: SafeArea(
-              child: FloatingActionButton.extended(
+              child: M3ExpandedFab(
                 onPressed: () => _showCreateTaskDialog(context, ref),
                 icon: const Icon(Icons.add),
                 label: const Text('New Task'),
@@ -588,7 +589,7 @@ class _TasksListScreenState extends ConsumerState<TasksListScreen>
     var showTitleGemini = false;
     Timer? titleTypingTimer;
 
-    await showDialog<void>(
+    await m3ShowDialog<void>(
       context: context,
       builder: (dialogContext) {
         bool saving = false;
@@ -1099,8 +1100,11 @@ class _StatusSummaryCard extends StatelessWidget {
       _ => scheme.onSurfaceVariant,
     };
 
+    // M3 Expressive: filled card with semantic tonal color, no shadow.
     return Card(
       color: background,
+      elevation: 0,
+      shadowColor: Colors.transparent,
       // summary cards are compact — use compact token for consistent density
       shape: AppSurfaces.of(context).compactShape,
       child: Padding(