Drop the rings behind the call avatar

A pair of translucent `primary` circles stood in for the kit's animation.
Against the gradient they read as banding -- two hard edges around the one
thing on screen -- which is what "the box around the center elements" was.
The avatar carries the centre on its own.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

app/src/main/kotlin/io/flamenet/messenger/app/CallScreen.kt

@@ -1,7 +1,6 @@
 package io.flamenet.messenger.app
 
 import androidx.compose.foundation.background
-import androidx.compose.foundation.border
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -76,17 +75,11 @@ fun CallScreenBody(
     ) {
         Spacer(Modifier.height(Space.xxl))
 
+        // ⚠️ No rings. A pair of translucent `primary` circles sat behind the
+        // avatar as a stand-in for the kit's animation, and against the
+        // gradient they read as banding — two hard edges around the one thing
+        // on screen. The avatar carries the centre on its own.
         Box(contentAlignment = Alignment.Center) {
-            Box(
-                modifier = Modifier
-                    .size(260.dp)
-                    .border(24.dp, MaterialTheme.colorScheme.primary.copy(alpha = 0.10f), CircleShape)
-            )
-            Box(
-                modifier = Modifier
-                    .size(190.dp)
-                    .border(16.dp, MaterialTheme.colorScheme.primary.copy(alpha = 0.18f), CircleShape)
-            )
             Box(
                 modifier = Modifier.size(128.dp).clip(CircleShape).background(Palette.AvatarFill),
                 contentAlignment = Alignment.Center,