Fix privacy screen colors (#411)

### Description
Fixes this monstrosity.

<img width="320" alt="Screenshot 2024-01-06 at 10 17 28 PM"
src="https://github.com/ente-io/auth/assets/1161789/30964804-8e7e-429b-b4f0-6963059c931b">
  
  
### Note
On iOS, the colors could still be inverted if the user has opted for a
theme different from the system theme, since `LaunchImage` is
dynamically provided by iOS

analysis_options.yaml

@@ -41,8 +41,8 @@ analyzer:
     use_rethrow_when_possible: info
     require_trailing_commas: error
 
-    prefer_const_constructors: error # too many warnings
-    prefer_const_declarations: error # too many warnings
+    prefer_const_constructors: warning
+    prefer_const_declarations: warning
     prefer_const_constructors_in_immutables: ignore # too many warnings
 
     avoid_renaming_method_parameters: ignore # incorrect warnings for `equals` overrides

ios/Podfile.lock

@@ -216,12 +216,12 @@ SPEC CHECKSUMS:
   fk_user_agent: 1f47ec39291e8372b1d692b50084b0d54103c545
   Flutter: f04841e97a9d0b0a8025694d0796dd46242b2854
   flutter_email_sender: 02d7443217d8c41483223627972bfdc09f74276b
-  flutter_inappwebview: bfd58618f49dc62f2676de690fc6dcda1d6c3721
+  flutter_inappwebview: acd4fc0f012cefd09015000c241137d82f01ba62
   flutter_local_notifications: 0c0b1ae97e741e1521e4c1629a459d04b9aec743
   flutter_native_splash: 52501b97d1c0a5f898d687f1646226c1f93c56ef
   flutter_secure_storage: 23fc622d89d073675f2eaa109381aefbcf5a49be
   flutter_sodium: c84426b4de738514b5b66cfdeb8a06634e72fe0b
-  fluttertoast: fafc4fa4d01a6a9e4f772ecd190ffa525e9e2d9c
+  fluttertoast: 31b00dabfa7fb7bacd9e7dbee580d7a2ff4bf265
   FMDB: 2ce00b547f966261cd18927a3ddb07cb6f3db82a
   local_auth_ios: c6cf091ded637a88f24f86a8875d8b0f526e2605
   move_to_background: 39a5b79b26d577b0372cbe8a8c55e7aa9fcd3a2d
@@ -247,4 +247,4 @@ SPEC CHECKSUMS:
 
 PODFILE CHECKSUM: b4e3a7eabb03395b66e81fc061789f61526ee6bb
 
-COCOAPODS: 1.12.1
+COCOAPODS: 1.14.3

lib/main.dart

@@ -21,6 +21,7 @@ import 'package:ente_auth/ui/utils/icon_utils.dart';
 import 'package:ente_auth/utils/crypto_util.dart';
 import 'package:flutter/foundation.dart';
 import "package:flutter/material.dart";
+import 'package:flutter/scheduler.dart';
 import 'package:flutter_displaymode/flutter_displaymode.dart';
 import 'package:logging/logging.dart';
 import 'package:path_provider/path_provider.dart';
@@ -30,28 +31,13 @@ final _logger = Logger("main");
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
-  final savedThemeMode = await AdaptiveTheme.getThemeMode();
-  await _runInForeground(savedThemeMode);
-  await PrivacyScreen.instance.enable(
-    iosOptions: const PrivacyIosOptions(
-      enablePrivacy: true,
-      privacyImageName: "LaunchImage",
-      lockTrigger: IosLockTrigger.didEnterBackground,
-    ),
-    androidOptions: const PrivacyAndroidOptions(
-      enableSecure: true,
-    ),
-    backgroundColor: savedThemeMode == AdaptiveThemeMode.dark
-        ? Colors.black
-        : Colors.white,
-    blurEffect: savedThemeMode == AdaptiveThemeMode.dark
-        ? PrivacyBlurEffect.dark
-        : PrivacyBlurEffect.extraLight,
-  );
+  await _runInForeground();
+  await _setupPrivacyScreen();
   FlutterDisplayMode.setHighRefreshRate();
 }
 
-Future<void> _runInForeground(AdaptiveThemeMode? savedThemeMode) async {
+Future<void> _runInForeground() async {
+  final savedThemeMode = _themeMode(await AdaptiveTheme.getThemeMode());
   return await _runWithLogs(() async {
     _logger.info("Starting app in foreground");
     await _init(false, via: 'mainMethod');
@@ -65,7 +51,7 @@ Future<void> _runInForeground(AdaptiveThemeMode? savedThemeMode) async {
         locale: locale,
         lightTheme: lightThemeData,
         darkTheme: darkThemeData,
-        savedThemeMode: _themeMode(savedThemeMode),
+        savedThemeMode: savedThemeMode,
       ),
     );
   });
@@ -107,3 +93,22 @@ Future<void> _init(bool bool, {String? via}) async {
   await UpdateService.instance.init();
   await IconUtils.instance.init();
 }
+
+Future<void> _setupPrivacyScreen() async {
+  final brightness =
+      SchedulerBinding.instance.platformDispatcher.platformBrightness;
+  bool isInDarkMode = brightness == Brightness.dark;
+  await PrivacyScreen.instance.enable(
+    iosOptions: const PrivacyIosOptions(
+      enablePrivacy: true,
+      privacyImageName: "LaunchImage",
+      lockTrigger: IosLockTrigger.didEnterBackground,
+    ),
+    androidOptions: const PrivacyAndroidOptions(
+      enableSecure: true,
+    ),
+    backgroundColor: isInDarkMode ? Colors.black : Colors.white,
+    blurEffect:
+        isInDarkMode ? PrivacyBlurEffect.dark : PrivacyBlurEffect.extraLight,
+  );
+}

pubspec.yaml

@@ -1,6 +1,6 @@
 name: ente_auth
 description: ente two-factor authenticator
-version: 2.0.30+230
+version: 2.0.31+231
 publish_to: none
 
 environment: