feat: Enhance group chat functionality and UI improvements

- Added support for group action system messages in MessageBubble.
- Implemented group invite handling with inline cards for joining groups.
- Updated MessageBubble to display group sender labels and admin badges.
- Enhanced image decryption logic for group attachments.
- Modified BlurredAvatarBackground to load system avatars based on public keys.
- Improved SwipeBackContainer with layer management for better swipe effects.
- Updated VerifiedBadge to use dynamic icons based on user verification status.
- Added new drawable resource for admin badge icon.

app/src/main/res/drawable/ic_arrow_badge_down_filled.xml

@@ -0,0 +1,9 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportWidth="24"
+    android:viewportHeight="24">
+    <path
+        android:fillColor="#FF000000"
+        android:pathData="M16.375,6.22l-4.375,3.498l-4.375,-3.5a1,1 0,0 0,-1.625,0.782v6a1,1 0,0 0,0.375,0.78l5,4a1,1 0,0 0,1.25,0l5,-4a1,1 0,0 0,0.375,-0.78v-6a1,1 0,0 0,-1.625,-0.78z" />
+</vector>