refactor: update splash screen colors and remove Weblate configuration

- Changed the dark splash screen color in pubspec.yaml and styles.xml to #0B0E14 for better aesthetics.
- Removed the weblate.yaml file to streamline localization management and eliminate unused configurations.
- Updated background images for night mode in Android and iOS to ensure consistency across platforms.

pubspec.yaml

@@ -97,7 +97,7 @@ flutter:
 flutter_native_splash:
   # Splash background matches the light theme; `color_dark` handles dark mode.
   color: "#FFFFFF"
-  color_dark: "#000000"
+  color_dark: "#0B0E14"
   # Image to display on the splash screen
   image: assets/icons/icon.png
 
@@ -105,7 +105,7 @@ flutter_native_splash:
   # Android specific settings
   android_12:
     color: "#FFFFFF"
-    color_dark: "#000000"
+    color_dark: "#0B0E14"
   
   # Web specific settings
   web: false