feat: remember window size (#404)

Fixes #398

lib/view/page/setting/entry.dart

@@ -11,6 +11,7 @@ import 'package:server_box/data/res/provider.dart';
 import 'package:server_box/data/res/rebuild.dart';
 import 'package:server_box/data/res/store.dart';
 import 'package:server_box/data/res/url.dart';
+import 'package:server_box/view/page/setting/platform/platform_pub.dart';
 
 import '../../../core/route.dart';
 import '../../../data/model/app/net_view.dart';
@@ -1071,6 +1072,7 @@ class _SettingPageState extends State<SettingPage> {
         _buildCollapseUI(),
         _buildCupertinoRoute(),
         if (isDesktop) _buildHideTitleBar(),
+        if (isDesktop) PlatformPublicSettings.buildSaveWindowSize(),
       ],
     );
   }

lib/view/page/setting/platform/platform_pub.dart

@@ -2,6 +2,7 @@ import 'package:fl_lib/fl_lib.dart';
 import 'package:flutter/material.dart';
 import 'package:server_box/core/extension/context/locale.dart';
 import 'package:server_box/data/res/store.dart';
+import 'package:window_manager/window_manager.dart';
 
 abstract final class PlatformPublicSettings {
   static Widget buildBioAuth() {
@@ -45,4 +46,48 @@ abstract final class PlatformPublicSettings {
       },
     );
   }
+
+  static Widget buildSaveWindowSize() {
+    final isBusy = false.vn;
+    // Only show [FadeIn] when previous state is busy.
+    var lastIsBusy = false;
+    final prop = Stores.setting.windowSize;
+
+    return ListTile(
+      title: Text(l10n.rememberWindowSize),
+      /// Copied from `fl_build/view/store_switch`
+      trailing: ValBuilder(
+        listenable: isBusy,
+        builder: (busy) {
+          return ValBuilder(
+            listenable: prop.listenable(),
+            builder: (value) {
+              if (busy) {
+                lastIsBusy = true;
+                return UIs.centerSizedLoadingSmall.paddingOnly(right: 17);
+              }
+
+              final switcher = Switch(
+                value: value.isNotEmpty,
+                onChanged: (value) async {
+                  isBusy.value = true;
+                  final size = await windowManager.getSize();
+                  isBusy.value = false;
+                  prop.put(size.toIntStr());
+                },
+              );
+
+              if (lastIsBusy) {
+                final ret = FadeIn(child: switcher);
+                lastIsBusy = false;
+                return ret;
+              }
+
+              return switcher;
+            },
+          );
+        },
+      ),
+    );
+  }
 }