chore: update versioning and launcher icons

- Incremented versionCode to 2 and versionName to 1.0.1 in build.gradle.kts for the new release.
- Updated the ic_launcher_background color in ic_launcher_colors.xml to better match the app's branding.
- Replaced multiple launcher icon assets across various resolutions to ensure consistency in the app's appearance.

mobile-app/composeApp/build.gradle.kts

@@ -58,8 +58,8 @@ android {
         applicationId = "de.tsschulz.tt_tagebuch"
         minSdk = libs.versions.android.minSdk.get().toInt()
         targetSdk = libs.versions.android.targetSdk.get().toInt()
-        versionCode = 1
-        versionName = "1.0.0"
+        versionCode = 2
+        versionName = "1.0.1"
         buildConfigField("String", "BACKEND_BASE_URL", "\"$backendBaseUrl\"")
         buildConfigField("String", "SOCKET_BASE_URL", "\"$socketBaseUrl\"")
     }

mobile-app/composeApp/src/androidMain/res/values/ic_launcher_colors.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-    <!-- Entspricht legacy Expo android.adaptiveIcon.backgroundColor -->
-    <color name="ic_launcher_background">#FFFFFF</color>
+    <!-- Näher am Web-Header (.app-header, Primärton ~rgb(24,70,54)) für adaptive Icons -->
+    <color name="ic_launcher_background">#184636</color>
 </resources>