feat(desktop): tray Do-Not-Disturb + Launch-on-login toggle (P6-1 web)

- useTauriDnd + manualDndAtom: the native tray "Do Not Disturb" toggle
  (lotus-dnd-changed event) OR's into the notification quiet-gate in
  ClientNonUIFeatures (both invite + message notifiers), alongside Focus Assist.
- AutostartSetting in Settings → General (desktop-only): reads/sets
  plugin:autostart via invoke. Mirrors the window-chrome setting.
- Docs: LOTUS_FEATURES desktop section (Linux parity + DND + autostart),
  LOTUS_TODO P6-1 → [~], LOTUS_BUGS verification row.

Gates: tsc/eslint/prettier clean, build OK, 661 tests. Native side committed on
cinny-desktop:main (CI-compile-pending).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/components/TauriDesktopFeatures.tsx

@@ -5,6 +5,7 @@ import { useTauriSmtc } from '../hooks/useTauriSmtc';
 import { useTauriNetwork } from '../hooks/useTauriNetwork';
 import { useTauriToastActions } from '../hooks/useTauriToastActions';
 import { useTauriFocusAssist } from '../hooks/useTauriFocusAssist';
+import { useTauriDnd } from '../hooks/useTauriDnd';
 
 /**
  * Mounts the client-scoped native desktop feature hooks (call/room aware). Each
@@ -21,5 +22,6 @@ export function TauriDesktopFeatures(): null {
   useTauriNetwork(); // P5-49 network-change awareness → sync retry
   useTauriToastActions(); // P5-41/35 rich toast click → open room, quick reply → send
   useTauriFocusAssist(); // P5-56 Windows Focus Assist → DND suppression atom
+  useTauriDnd(); // P6-1 tray "Do Not Disturb" → notification suppression atom
   return null;
 }

src/app/features/settings/general/General.tsx

@@ -102,7 +102,7 @@ import { useMessageLayoutItems } from '../../../hooks/useMessageLayout';
 import { useMessageSpacingItems } from '../../../hooks/useMessageSpacing';
 import { SequenceCardStyle } from '../styles.css';
 import { useTauriUpdater } from '../../../hooks/useTauriUpdater';
-import { isTauri as isTauriEnv } from '../../../hooks/useTauri';
+import { isTauri as isTauriEnv, invokeTauri, tauriInvoke } from '../../../hooks/useTauri';
 import { customWindowChromeAtom } from '../../../state/customWindowChrome';
 import { useDateFormatItems } from '../../../hooks/useDateFormat';
 import { playCallJoinSound } from '../../../utils/callSounds';
@@ -129,6 +129,38 @@ function DesktopChromeSetting() {
   );
 }
 
+/**
+ * P6-1 — "Launch on login" toggle (desktop only). Renders nothing in the
+ * browser. Reads the current state from the `autostart` plugin on mount and
+ * enables/disables it via the plugin commands when flipped. Not backed by an
+ * atom — the OS registration is the source of truth, mirrored into local state.
+ */
+function AutostartSetting() {
+  const [enabled, setEnabled] = useState(false);
+
+  useEffect(() => {
+    tauriInvoke()?.('plugin:autostart|is_enabled')
+      .then((value) => setEnabled(value === true))
+      .catch(() => undefined);
+  }, []);
+
+  const handleChange = (value: boolean) => {
+    invokeTauri(value ? 'plugin:autostart|enable' : 'plugin:autostart|disable');
+    setEnabled(value);
+  };
+
+  if (!isTauriEnv()) return null;
+  return (
+    <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
+      <SettingTile
+        title="Launch on login"
+        description="Start Lotus Chat automatically when you sign in to your computer."
+        after={<Switch variant="Primary" value={enabled} onChange={handleChange} />}
+      />
+    </SequenceCard>
+  );
+}
+
 type ThemeSelectorProps = {
   themeNames: Record<string, string>;
   themes: Theme[];
@@ -443,6 +475,7 @@ function Appearance() {
       </SequenceCard>
 
       <DesktopChromeSetting />
+      <AutostartSetting />
 
       <SequenceCard className={SequenceCardStyle} variant="SurfaceVariant" direction="Column">
         <SettingTile

src/app/hooks/useTauriDnd.ts

@@ -0,0 +1,21 @@
+import { useSetAtom } from 'jotai';
+import { manualDndAtom } from '../state/manualDnd';
+import { useTauriEvent } from './useTauri';
+
+/** Detail shape of the `lotus-dnd-changed` event emitted by the native side. */
+type DndChangedDetail = {
+  active: boolean;
+};
+
+/**
+ * P6-1 — Tray "Do Not Disturb" → notification suppression (desktop). Subscribes
+ * to the native `lotus-dnd-changed` event (emitted when the user toggles the
+ * tray "Do Not Disturb" item, `{ active }`) and mirrors it into `manualDndAtom`,
+ * which the notification gate reads to suppress notifications while DND is on.
+ * Inert in the browser, since `useTauriEvent` only listens under Tauri.
+ */
+export function useTauriDnd(): void {
+  const setDnd = useSetAtom(manualDndAtom);
+
+  useTauriEvent<DndChangedDetail>('lotus-dnd-changed', ({ active }) => setDnd(active));
+}

src/app/pages/client/ClientNonUIFeatures.tsx

@@ -10,6 +10,7 @@ import {
   ThreadEvent,
 } from 'matrix-js-sdk';
 import { focusAssistActiveAtom } from '../../state/focusAssist';
+import { manualDndAtom } from '../../state/manualDnd';
 import { roomToUnreadAtom, unreadEqual, unreadInfoToUnread } from '../../state/room/roomToUnread';
 import LogoSVG from '../../../../public/res/lotus.png';
 import LogoUnreadSVG from '../../../../public/res/lotus-unread.png';
@@ -128,6 +129,7 @@ function InviteNotifications() {
   const [notificationSound] = useSetting(settingsAtom, 'isNotificationSounds');
   const [quietHoursEnabled] = useSetting(settingsAtom, 'quietHoursEnabled');
   const focusAssistActive = useAtomValue(focusAssistActiveAtom);
+  const manualDnd = useAtomValue(manualDndAtom);
   const [quietHoursStart] = useSetting(settingsAtom, 'quietHoursStart');
   const [quietHoursEnd] = useSetting(settingsAtom, 'quietHoursEnd');
   const [inviteSoundId] = useSetting(settingsAtom, 'inviteSoundId');
@@ -187,7 +189,9 @@ function InviteNotifications() {
   useEffect(() => {
     if (invites.length > perviousInviteLen && mx.getSyncState() === 'SYNCING') {
       const quietActive =
-        focusAssistActive || (quietHoursEnabled && isInQuietHours(quietHoursStart, quietHoursEnd));
+        focusAssistActive ||
+        manualDnd ||
+        (quietHoursEnabled && isInQuietHours(quietHoursStart, quietHoursEnd));
       if (!quietActive) {
         if (showNotifications && notificationPermission('granted')) {
           notify(invites.length - perviousInviteLen);
@@ -210,6 +214,7 @@ function InviteNotifications() {
     quietHoursStart,
     quietHoursEnd,
     focusAssistActive,
+    manualDnd,
     inviteSoundId,
   ]);
 
@@ -236,6 +241,7 @@ function MessageNotifications() {
   const [notificationSound] = useSetting(settingsAtom, 'isNotificationSounds');
   const [quietHoursEnabled] = useSetting(settingsAtom, 'quietHoursEnabled');
   const focusAssistActive = useAtomValue(focusAssistActiveAtom);
+  const manualDnd = useAtomValue(manualDndAtom);
   const [quietHoursStart] = useSetting(settingsAtom, 'quietHoursStart');
   const [quietHoursEnd] = useSetting(settingsAtom, 'quietHoursEnd');
   const [messageSoundId] = useSetting(settingsAtom, 'messageSoundId');
@@ -374,7 +380,9 @@ function MessageNotifications() {
       }
 
       const quietActive =
-        focusAssistActive || (quietHoursEnabled && isInQuietHours(quietHoursStart, quietHoursEnd));
+        focusAssistActive ||
+        manualDnd ||
+        (quietHoursEnabled && isInQuietHours(quietHoursStart, quietHoursEnd));
       if (quietActive) return;
 
       if (showNotifications && notificationPermission('granted')) {
@@ -409,6 +417,7 @@ function MessageNotifications() {
       quietHoursStart,
       quietHoursEnd,
       focusAssistActive,
+      manualDnd,
       messageSoundId,
     ],
   );

src/app/state/manualDnd.ts

@@ -0,0 +1,14 @@
+import { atom } from 'jotai';
+
+/**
+ * P6-1 — Tray "Do Not Disturb" ↔ notification suppression (manual toggle).
+ *
+ * Standalone, non-persisted boolean atom reflecting whether the user has flipped
+ * the native tray "Do Not Disturb" item. It is driven at runtime by
+ * `useTauriDnd` from the native `lotus-dnd-changed` event and read by the
+ * notification gate to suppress notifications while DND is on. Because it mirrors
+ * a transient session toggle — not a persisted user preference — it is a plain
+ * in-memory atom that defaults to `false` and is intentionally NOT written to
+ * `localStorage`.
+ */
+export const manualDndAtom = atom(false);