Revert "Switched to WorkManager for reliability (#608)"

This reverts commit d3247a9ec1.

pubspec.lock

@@ -1,6 +1,14 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  android_alarm_manager_plus:
+    dependency: "direct main"
+    description:
+      name: android_alarm_manager_plus
+      sha256: "82fb28c867c4b3dd7e9157728e46426b8916362f977dbba46b949210f00099f4"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.3"
   android_intent_plus:
     dependency: "direct main"
     description:
@@ -923,14 +931,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.1.2"
-  workmanager:
-    dependency: "direct main"
-    description:
-      name: workmanager
-      sha256: ed13530cccd28c5c9959ad42d657cd0666274ca74c56dea0ca183ddd527d3a00
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.5.2"
   xdg_directories:
     dependency: transitive
     description:
@@ -956,5 +956,5 @@ packages:
     source: hosted
     version: "3.1.2"
 sdks:
-  dart: ">=3.1.2 <4.0.0"
+  dart: ">=3.1.0 <4.0.0"
   flutter: ">=3.13.0"