feat: file variety, user status, DND gate, drag-drop, mentions, link preview, emoji picker, soundboard, ringtone

Attachments
- Video: native <video controls>, decrypted blob, metadata preload
- PDF: collapsible <object> viewer with download + preview toggle
- Generic: file card with lazy decrypt, mime-to-extension map
- MessageBubble dispatch: audio/image/video/pdf/generic by mime
- Composer accept widened from image/* to any; AttachmentPreview renders
  non-images as file cards

User status
- usePeerPresence returns { state, statusMessage } and tracks both fields
  via realtime updates
- ConversationHeader subtitle shows custom status_message when peer is
  online/idle/dnd (with message set); falls back to localized presence
  label; always "Offline" when state === 'offline'
- UserBar: status_message input in dropdown (max 128 chars, save on
  blur/Enter), subtitle uses same precedence as peer view
- AuthContext: auto-flip offline → online on session mount; best-effort
  offline on beforeunload/pagehide; respects explicit idle/dnd/invisible
- i18n: presence.status_placeholder (DE + EN)

DND
- CallUI: incoming ring suppressed when own presence === 'dnd' (outgoing
  rings stay audible — user-initiated)
- CallContext: presenceRef mirrors profile.presenceState, incoming-call
  and missed-call OS notifications skipped under DND
- ConversationsContext already gated message tone + notify

Drag/drop + paste
- Page-root drag handlers feed ingestFiles; overlay shown while dragging
- Textarea onPaste extracts clipboard image items

@mentions in groups
- MentionAutocomplete: keyboard-driven dropdown, arrow/enter/tab/esc
- Composer onChange parses trailing @token, auto-open
- renderBodyWithMentions highlights @username tokens in bubbles

Link previews
- Migration 20260421000003_link_previews.sql (cache table, auth read,
  service-role write via edge function)
- Edge function og-preview: POST {url}, fetches HTML (6s timeout, 1MB
  cap), regex-parses OG/twitter/description, upserts cache
- useLinkPreview hook with in-memory cache + inflight dedup
- LinkPreviewCard rendered from first URL in message body

Emoji picker
- Built-in curated set (~250 emojis) across five categories
- Search by keyword/emoji char/category, recent list persisted in
  localStorage
- Trigger button next to + and voice buttons in composer

Soundboard + ringtone + mic pipeline
- Pulled in (user-authored) SoundboardManagerDialog/Panel/Settings,
  RingtoneSettings, mic pipeline + hotkeys + storage modules
- AuthContext imports updateOwnProfile for presence auto-flip

Fixes
- AttachmentAudio min-width so bubbles don't collapse to 0px on peer
  side
- Focus flicker: visibility/online wake refresh throttled to 30s,
  focus listener dropped, loading flag only on first fetch

apps/desktop/src/components/ConversationHeader.tsx

@@ -6,6 +6,7 @@ import { useTranslation } from 'react-i18next';
 import { useAuth } from '../context/AuthContext';
 import { useCall } from '../context/CallContext';
 import { useCallPresence } from '../lib/useCallPresence';
+import type { PeerPresence } from '../lib/usePeerPresence';
 import { Avatar } from './Avatar';
 import {
   InfoIcon,
@@ -26,7 +27,7 @@ const PRESENCE_DOT: Record<PresenceState, string> = {
 
 interface Props {
   conversation: ConversationSummary | null;
-  peerPresence: PresenceState | null;
+  peerPresence: PeerPresence | null;
   onInfoClick?: () => void;
   onSearchClick?: () => void;
 }
@@ -51,7 +52,7 @@ export function ConversationHeader({ conversation, peerPresence, onInfoClick, on
 
 interface HeaderBarProps {
   conversation: ConversationSummary;
-  peerPresence: PresenceState | null;
+  peerPresence: PeerPresence | null;
   onInfoClick?: () => void;
   onSearchClick?: () => void;
 }
@@ -65,8 +66,18 @@ function HeaderBar({ conversation, peerPresence, onInfoClick, onSearchClick }: H
   const peerAvatar = isDm ? (conversation.peer?.avatarUrl ?? null) : (conversation.avatarUrl ?? null);
 
   // Hide presence when peer chose invisible — reciprocal privacy.
-  const showPresence = isDm && peerPresence && peerPresence !== 'invisible';
-  const presenceLabel = peerPresence ? t('app:presence.' + peerPresence) : '';
+  const peerState = peerPresence?.state ?? null;
+  const showPresence = isDm && peerState && peerState !== 'invisible';
+  // Subtitle priority: custom status_message when online (or idle/dnd), else
+  // the localized presence label. Offline always wins → just "Offline".
+  const presenceLabel = (() => {
+    if (!peerState) return '';
+    if (peerState === 'offline') return t('app:presence.offline');
+    if (peerPresence?.statusMessage && peerPresence.statusMessage.trim().length > 0) {
+      return peerPresence.statusMessage.trim();
+    }
+    return t('app:presence.' + peerState);
+  })();
 
   return (
     <header className="flex items-center gap-3 border-b border-line bg-surface-3 px-6 py-3">
@@ -80,12 +91,12 @@ function HeaderBar({ conversation, peerPresence, onInfoClick, onSearchClick }: H
             <UsersIcon className="h-5 w-5" />
           </div>
         )}
-        {showPresence && peerPresence && (
+        {showPresence && peerState && (
           <span
             aria-hidden="true"
             className={
               'absolute -bottom-0.5 -right-0.5 h-3 w-3 rounded-full ring-2 ring-surface-3 ' +
-              PRESENCE_DOT[peerPresence]
+              PRESENCE_DOT[peerState]
             }
           />
         )}