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/SoundboardSettings.tsx

@@ -0,0 +1,83 @@
+import { useEffect, useState } from 'react';
+import { useTranslation } from 'react-i18next';
+
+import {
+  listSounds,
+  subscribeSoundboardChanges,
+  type SoundboardEntry,
+} from '../lib/soundboardStorage';
+import { SoundboardManagerDialog } from './SoundboardManagerDialog';
+import { ArrowRightIcon } from './icons';
+
+// Entry point into the soundboard manager from the settings page. Shows a
+// tiny summary (count, category count) and opens the big dialog on click.
+export function SoundboardSettings() {
+  const { t } = useTranslation(['app']);
+  const [open, setOpen] = useState(false);
+  const [entries, setEntries] = useState<SoundboardEntry[]>([]);
+
+  useEffect(() => {
+    let cancelled = false;
+    const refresh = async () => {
+      try {
+        const all = await listSounds();
+        if (!cancelled) setEntries(all);
+      } catch (err: unknown) {
+        console.warn('listSounds failed', err);
+      }
+    };
+    void refresh();
+    const unsub = subscribeSoundboardChanges(() => {
+      void refresh();
+    });
+    return () => {
+      cancelled = true;
+      unsub();
+    };
+  }, []);
+
+  const categoryCount = new Set(entries.map((e) => e.category ?? '__uncat')).size;
+  const withHotkey = entries.filter((e) => e.hotkey !== null).length;
+
+  return (
+    <>
+      <div className="flex items-center justify-between gap-4">
+        <div className="min-w-0 flex-1">
+          <p className="text-sm font-medium text-fg">
+            {t('app:soundboard.summary_title', { defaultValue: 'Deine Sounds' })}
+          </p>
+          <p className="mt-1 text-xs text-fg-muted">
+            {entries.length === 0
+              ? t('app:soundboard.summary_empty', {
+                  defaultValue: 'Noch keine Sounds vorhanden.',
+                })
+              : t('app:soundboard.summary_counts', {
+                  defaultValue:
+                    '{{sounds}} Sounds · {{categories}} Kategorien · {{hotkeys}} mit Hotkey',
+                  sounds: entries.length,
+                  categories: categoryCount,
+                  hotkeys: withHotkey,
+                })}
+          </p>
+        </div>
+        <button
+          type="button"
+          onClick={() => setOpen(true)}
+          className="inline-flex shrink-0 cursor-pointer items-center gap-1.5 rounded-lg bg-accent px-3 py-1.5 text-xs font-semibold text-accent-fg transition hover:brightness-110"
+        >
+          <span>
+            {t('app:soundboard.manage', { defaultValue: 'Verwalten' })}
+          </span>
+          <ArrowRightIcon className="h-3.5 w-3.5" />
+        </button>
+      </div>
+      <p className="text-[11px] text-fg-muted">
+        {t('app:soundboard.settings_hint', {
+          defaultValue:
+            'Hotkeys sind optional. Sounds lassen sich auch während eines Anrufs direkt im UI abspielen.',
+        })}
+      </p>
+      <SoundboardManagerDialog open={open} onClose={() => setOpen(false)} />
+    </>
+  );
+}