feat: taskbar title shows file name, icon sizes 16-256, settings order, fixed 4-col size grid (v1.9.0)

lib/screens/viewer_screen.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:io';
 import 'package:flutter/material.dart';
+import 'package:path/path.dart' as p;
 import 'package:window_manager/window_manager.dart';
 import 'package:desktop_drop/desktop_drop.dart';
 import 'package:pdf/pdf.dart';
@@ -18,7 +19,7 @@ import '../shortcuts/app_shortcuts.dart';
 import '../services/window_persistence.dart';
 import '../l10n/app_localizations.dart';
 
-const appVersion = '1.8.0';
+const appVersion = '1.9.0';
 
 class ViewerScreen extends StatefulWidget {
   final List<String> initialFiles;
@@ -45,7 +46,10 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
     if (widget.initialFiles.isNotEmpty) {
       WidgetsBinding.instance.addPostFrameCallback((_) {
         FileHandler.loadImagesFromPaths(widget.initialFiles);
+        _updateTitle();
       });
+    } else {
+      WidgetsBinding.instance.addPostFrameCallback((_) => _updateTitle());
     }
   }
 
@@ -85,6 +89,18 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
 
   void _onImageManagerChanged() {
     setState(() => _hasImages = ImageManager.instance.images.isNotEmpty);
+    _updateTitle();
+  }
+
+  /// Taskbar/alt-tab başlığı = açılan dosyanın adı (görsel yoksa uygulama adı).
+  Future<void> _updateTitle() async {
+    final image = ImageManager.instance.currentImagePath;
+    final name = image.isEmpty ? 'imajViewer' : p.basename(image);
+    try {
+      await windowManager.setTitle(name);
+    } catch (_) {
+      // Başlık güncellenemezse sessizce geç.
+    }
   }
 
   Future<void> _doSave() async {
@@ -111,6 +127,36 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
               mainAxisSize: MainAxisSize.min,
               crossAxisAlignment: CrossAxisAlignment.start,
               children: [
+                if (_hasImages) ...[
+                  Text(AppLocalizations.of(context)!.fileProperties,
+                      style: const TextStyle(color: Colors.white70, fontSize: 13)),
+                  const SizedBox(height: 4),
+                  FutureBuilder<List<(String, String)>>(
+                    future: _fileProperties(ImageManager.instance.currentImagePath),
+                    builder: (context, snap) {
+                      if (!snap.hasData) return const SizedBox(height: 20);
+                      return Column(
+                        crossAxisAlignment: CrossAxisAlignment.start,
+                        children: snap.data!.map((r) => Padding(
+                          padding: const EdgeInsets.only(bottom: 2),
+                          child: Text.rich(
+                            TextSpan(children: [
+                              TextSpan(text: '${r.$1}: ', style: const TextStyle(color: Colors.white70, fontSize: 13)),
+                              TextSpan(text: r.$2, style: const TextStyle(color: Colors.white, fontSize: 13)),
+                            ]),
+                          ),
+                        )).toList(),
+                      );
+                    },
+                  ),
+                  const SizedBox(height: 12),
+                  const Divider(color: Colors.white24, height: 24),
+                ],
+                WindowSizeSelector(
+                  workArea: _workArea,
+                  onPick: _applyWindowSize,
+                ),
+                const Divider(color: Colors.white24, height: 24),
                 Text(AppLocalizations.of(context)!.sortBy,
                     style: const TextStyle(color: Colors.white70, fontSize: 13)),
                 RadioListTile<bool>(
@@ -137,36 +183,6 @@ class _ViewerScreenState extends State<ViewerScreen> with WindowListener {
                     setDialogState(() {});
                   },
                 ),
-                const Divider(color: Colors.white24, height: 24),
-                WindowSizeSelector(
-                  workArea: _workArea,
-                  onPick: _applyWindowSize,
-                ),
-                const Divider(color: Colors.white24, height: 24),
-                if (_hasImages) ...[
-                  Text(AppLocalizations.of(context)!.fileProperties,
-                      style: const TextStyle(color: Colors.white70, fontSize: 13)),
-                  const SizedBox(height: 4),
-                  FutureBuilder<List<(String, String)>>(
-                    future: _fileProperties(ImageManager.instance.currentImagePath),
-                    builder: (context, snap) {
-                      if (!snap.hasData) return const SizedBox(height: 20);
-                      return Column(
-                        crossAxisAlignment: CrossAxisAlignment.start,
-                        children: snap.data!.map((r) => Padding(
-                          padding: const EdgeInsets.only(bottom: 2),
-                          child: Text.rich(
-                            TextSpan(children: [
-                              TextSpan(text: '${r.$1}: ', style: const TextStyle(color: Colors.white70, fontSize: 13)),
-                              TextSpan(text: r.$2, style: const TextStyle(color: Colors.white, fontSize: 13)),
-                            ]),
-                          ),
-                        )).toList(),
-                      );
-                    },
-                  ),
-                  const SizedBox(height: 12),
-                ],
                 Text('imajViewer $appVersion',
                     style: const TextStyle(color: Colors.white, fontSize: 15)),
                 const SizedBox(height: 4),