fix: deduplicate VolumeSliderItem and add missing stopPropagation

- Extract VolumeSliderItem to voiceMenuItems.tsx (was duplicated in
  VoiceUser.tsx and VoiceChannel.tsx)
- Add e.stopPropagation() to all imperative context menu handlers
  for consistency with useContextMenu hook behavior

packages/web/src/components/voice/VoiceChannel.tsx

@@ -4,7 +4,7 @@ import { useSpaceStore, getChannelOrigin } from '../../stores/spaceStore';
 import { useAuthStore } from '../../stores/authStore';
 import { Avatar } from '../ui/Avatar';
 import { useContextMenuStore, type ContextMenuItem } from '../../stores/contextMenuStore';
-import { buildVoiceModMenuItems } from './voiceMenuItems';
+import { buildVoiceModMenuItems, VolumeSliderItem } from './voiceMenuItems';
 import { wsSend } from '../../hooks/useWebSocket';
 import { hasPermissionBit, PermissionBits } from '../../utils/permissions';
 
@@ -28,35 +28,6 @@ interface VoiceChannelProps {
 }
 
 /** Wrapper component for the volume slider so it can use hooks (useState). */
-function VolumeSliderItem({ userId }: { userId: string }) {
-  const volume = useVoiceStore((s) => s.participantVolumes.get(userId) ?? 100);
-  const setParticipantVolume = useVoiceStore((s) => s.setParticipantVolume);
-
-  return (
-    <div className="p-3">
-      <div className="text-xs text-txt-tertiary mb-2 font-medium uppercase tracking-wider">
-        User Volume
-      </div>
-      <div className="flex items-center gap-2">
-        <svg width="16" height="16" viewBox="0 0 24 24" fill="currentColor" className="text-txt-tertiary flex-shrink-0">
-          <path d="M3 9v6h4l5 5V4L7 9H3z" />
-        </svg>
-        <input
-          type="range"
-          min="0"
-          max="200"
-          value={volume}
-          onChange={(e) => setParticipantVolume(userId, parseInt(e.target.value))}
-          className="flex-1 accent-accent-primary h-1"
-        />
-        <span className="text-xs text-txt-secondary min-w-[32px] text-right">
-          {volume}%
-        </span>
-      </div>
-    </div>
-  );
-}
-
 export function VoiceChannel({ channelId, channelName, onClick, locked, canManage, onSettingsClick, dragState, onDragStart, onDragEnd }: VoiceChannelProps) {
   const serverVoiceUsers = useVoiceStore((s) => s.voiceUsers.get(channelId)) ?? EMPTY_VOICE_USERS;
   const currentVoiceChannel = useVoiceStore((s) => s.currentVoiceChannelId);
@@ -105,6 +76,7 @@ export function VoiceChannel({ channelId, channelName, onClick, locked, canManag
     (e: React.MouseEvent, userId: string) => {
       if (userId === myUser?.id) return;
       e.preventDefault();
+      e.stopPropagation();
 
       // Build moderation items
       const modItems = buildVoiceModMenuItems(userId, channelId);