refactor: update launcher icons and remove unused assets

fixes small notification icon problem

android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
   <background android:drawable="@color/ic_launcher_background"/>
-  <foreground android:drawable="@drawable/ic_launcher_foreground"/>
-  <monochrome android:drawable="@drawable/ic_launcher_foreground"/>
-</adaptive-icon>
+  <foreground android:drawable="@mipmap/ic_launcher_adaptive_fore"/>
+  <monochrome android:drawable="@mipmap/ic_launcher_adaptive_fore"/>
+</adaptive-icon>

pubspec.lock

@@ -137,22 +137,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
-  checked_yaml:
-    dependency: transitive
-    description:
-      name: checked_yaml
-      sha256: feb6bed21949061731a7a75fc5d2aa727cf160b91af9a3e464c5e3a32e28b5ff
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.3"
-  cli_util:
-    dependency: transitive
-    description:
-      name: cli_util
-      sha256: ff6785f7e9e3c38ac98b2fb035701789de90154024a75b6cb926445e83197d1c
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.4.2"
   clock:
     dependency: transitive
     description:
@@ -270,14 +254,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.0.6"
-  flutter_launcher_icons:
-    dependency: "direct dev"
-    description:
-      name: flutter_launcher_icons
-      sha256: bfa04787c85d80ecb3f8777bde5fc10c3de809240c48fa061a2c2bf15ea5211c
-      url: "https://pub.dev"
-    source: hosted
-    version: "0.14.3"
   flutter_localizations:
     dependency: "direct main"
     description: flutter

pubspec.yaml

@@ -40,7 +40,6 @@ dependencies:
       ref: 5ed5f6a502cd4c07e7b93b8066673d055d435a37
 
 dev_dependencies:
-  flutter_launcher_icons: ^0.14.3
   flutter_native_splash: ^2.4.5
   flutter_test:
     sdk: flutter
@@ -70,11 +69,3 @@ flutter_native_splash:
   android_12:
     image: assets/images/ic_splash.png
     image_dark: assets/images/ic_splash.png
-
-flutter_launcher_icons:
-  android: true
-  adaptive_icon_background: '#191919'
-  adaptive_icon_foreground: 'assets/images/ic_launcher_foreground.png'
-  adaptive_icon_round: 'assets/images/ic_launcher_round.png'
-  adaptive_icon_monochrome: 'assets/images/ic_launcher_foreground.png'
-  image_path: 'assets/images/ic_launcher.png'