feat: backup/restore, user profile popover, image compress, video blur, wake lock

- backup/restore dialog + user profile popover components
- image compression, video blur, wake lock utilities
- message cache + conversation messages hook refinements
- call context, active speakers, screen share dialog tweaks
- audio + screen share settings persistence
- refreshed app icons (smaller sizes) across all platforms

apps/desktop/src/components/ScreenShareDialog.tsx

@@ -7,6 +7,7 @@ import {
   getScreenShareSettings,
   PRESET_ORDER,
   type ScreenSharePreset,
+  updateScreenShareSettings,
 } from '../lib/screenShareSettings';
 import {
   MonitorShareIcon,
@@ -42,6 +43,7 @@ export function ScreenShareDialog({ open, onClose, onStart }: Props) {
   const [surface, setSurface] = useState<DisplaySurfaceHint>(initial.displaySurface);
   const [preset, setPreset] = useState<ScreenSharePreset>(initial.preset);
   const [framerate, setFramerate] = useState<number | null>(initial.framerateOverride);
+  const [includeAudio, setIncludeAudio] = useState<boolean>(initial.includeSystemAudio);
   const [busy, setBusy] = useState(false);
   const [error, setError] = useState<string | null>(null);
 
@@ -51,6 +53,9 @@ export function ScreenShareDialog({ open, onClose, onStart }: Props) {
     setBusy(true);
     setError(null);
     try {
+      // Persist the audio choice alongside the other picker prefs so the
+      // upstream startScreenShare picks it up on its settings read.
+      updateScreenShareSettings({ includeSystemAudio: includeAudio });
       await onStart({ preset, displaySurface: surface, framerate });
       onClose();
     } catch (err: unknown) {
@@ -165,6 +170,30 @@ export function ScreenShareDialog({ open, onClose, onStart }: Props) {
             </p>
           </div>
 
+          <div>
+            <label className="flex cursor-pointer items-start gap-2 rounded-lg border border-line bg-surface-2 px-3 py-2 text-xs hover:bg-surface">
+              <input
+                type="checkbox"
+                checked={includeAudio}
+                onChange={(e) => setIncludeAudio(e.target.checked)}
+                className="mt-0.5 accent-accent"
+              />
+              <span className="min-w-0 flex-1">
+                <span className="block font-semibold text-fg">
+                  {t('app:call.share_system_audio', {
+                    defaultValue: 'System-Sound mit übertragen',
+                  })}
+                </span>
+                <span className="mt-0.5 block text-[11px] text-fg-muted">
+                  {t('app:call.share_system_audio_hint', {
+                    defaultValue:
+                      '"Go Live" — Systemsound wird mitgesendet. Auf macOS braucht das extra Berechtigungen; wird sonst stumm geteilt.',
+                  })}
+                </span>
+              </span>
+            </label>
+          </div>
+
           {error && (
             <p role="alert" className="text-sm text-rose-600 dark:text-rose-300">
               {error}