feat: update FAB positioning logic in GroupSetupScreen to account for emoji panel and keyboard visibility

app/src/main/java/com/rosetta/messenger/ui/chats/GroupSetupScreen.kt

@@ -228,11 +228,13 @@ fun GroupSetupScreen(
     val imeBottomDp = with(density) { imeBottomPx.toDp() }
     val fabBottomPadding =
         if (coordinator.isEmojiBoxVisible) {
-            // Emoji panel height is already reserved by Scaffold bottomBar.
+            // Emoji panel is shown as Scaffold bottomBar → paddingValues already
+            // reserves space for it, so FAB only needs a small offset above it.
             14.dp
         } else if (imeBottomDp > 0.dp) {
-            // System keyboard is not part of Scaffold content padding.
-            imeBottomDp + 14.dp
+            // System keyboard is open but NOT covered by paddingValues.
+            // Place FAB at the same visual position as with the emoji panel.
+            14.dp + imeBottomDp
         } else {
             18.dp
         }