fix(audio-room): give hand-raise button a visible toggled state

Replace FilledTonalIconButton with FilledTonalIconToggleButton so the
container color reflects raised/lowered state, and drop the tautological
`if (handRaised) PanTool else PanTool` conditional flagged by Sonar.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

amethyst/src/main/java/com/vitorpamplona/amethyst/ui/screen/loggedIn/audiorooms/room/AudioRoomStage.kt

@@ -30,7 +30,7 @@ import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.material3.Card
 import androidx.compose.material3.CardDefaults
-import androidx.compose.material3.FilledTonalIconButton
+import androidx.compose.material3.FilledTonalIconToggleButton
 import androidx.compose.material3.Icon
 import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.Text
@@ -178,9 +178,12 @@ private fun AudioRoomStageContent(
                 horizontalArrangement = Arrangement.End,
                 verticalAlignment = Alignment.CenterVertically,
             ) {
-                FilledTonalIconButton(onClick = { handRaised = !handRaised }) {
+                FilledTonalIconToggleButton(
+                    checked = handRaised,
+                    onCheckedChange = { handRaised = it },
+                ) {
                     Icon(
-                        symbol = if (handRaised) MaterialSymbols.PanTool else MaterialSymbols.PanTool,
+                        symbol = MaterialSymbols.PanTool,
                         contentDescription =
                             stringRes(
                                 if (handRaised) R.string.audio_room_lower_hand else R.string.audio_room_raise_hand,