feat(discord-gateway): implement voice & push improvements

- Voice disconnect broadcast on stopRecording
- Multi-guild voice support (VoiceController Map<guildId>)
- Session finalization + auto-enqueue muxer job
- Recordings API: duration field, channelId/userId filters
- Transmitter Redis connection reuse (shared conn)
- FFmpeg stderr memory cap (4KB limit)
- 10 new Redis event channels + Redis bridge subscriptions
- New DB tables: message_reactions, message_edits
- Webhook notification module
- Gateway metrics / Prometheus endpoint
- Multi-guild message capture (MONITOR_GUILD_IDS array)
- Thread tracking, presence, channel topic, guild member events
- Edit history snapshot on message update
- Muxer audio post-processing worker

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

services/frontend/src/features/dashboard/components/ChannelProfileDetail.tsx

@@ -1,10 +1,7 @@
 import { motion } from "framer-motion";
 import { AlertCircle, ArrowLeft, Hash, RefreshCw } from "lucide-react";
 import type { DashboardChannelDetail } from "../../../shared/api/client";
-import {
-  cardItem,
-  cardStagger,
-} from "../../../shared/hooks/useFramerStagger";
+import { cardItem, cardStagger } from "../../../shared/hooks/useFramerStagger";
 import { cn } from "../../../shared/lib/utils";
 import {
   Badge,

services/frontend/src/features/dashboard/components/ChannelSummaryList.tsx

@@ -1,20 +1,9 @@
 import { motion } from "framer-motion";
-import {
-  AlertCircle,
-  Hash,
-  Loader2,
-  RefreshCw,
-  Search,
-} from "lucide-react";
+import { AlertCircle, Hash, Loader2, RefreshCw, Search } from "lucide-react";
 import type { DashboardChannel } from "../../../shared/api/client";
 import { cardItem, cardStagger } from "../../../shared/hooks/useFramerStagger";
 import { cn } from "../../../shared/lib/utils";
-import {
-  Card,
-  CardContent,
-  Input,
-  Skeleton,
-} from "../../../shared/ui";
+import { Card, CardContent, Input, Skeleton } from "../../../shared/ui";
 
 interface ChannelSummaryListProps {
   channels: DashboardChannel[];