fix(presence): Invisible, Hide Online Status, Idle and DND stick (#282)

usePresenceUpdater sent a one-off PUT /presence, but the SDK kept
long-polling /sync with the default set_presence=online and Synapse treats
every sync as "online", so Invisible / Hide Online Status / Idle / DND
flipped back within seconds — a privacy setting that silently didn't work.

The presence helpers now also call mx.setSyncPresence(): offline for
Invisible / Hide Online Status, unavailable for Idle / DND (and auto-mode
idle / hidden tab), online otherwise. The PUT stays for the immediate
change.

Verified on the local Synapse, another account polling every 5 s for 60 s
after a reload in each mode: invisible → offline ×12, hidePresence →
offline ×12, idle → unavailable ×12, dnd → unavailable ×12, online →
online (currently_active) ×12; /sync carries set_presence=offline /
unavailable / online accordingly (before: online* throughout).

Fixes #282

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/hooks/usePresenceUpdater.ts

@@ -1,4 +1,5 @@
 import { useEffect, useRef } from 'react';
+import { SetPresence } from 'matrix-js-sdk';
 import { PresenceDeduper, PresenceWrite } from '../utils/presenceWrite';
 import { useMatrixClient } from './useMatrixClient';
 import { getLastLocalStatusWrite, pickHeartbeatStatus } from '../utils/ownStatusSync';
@@ -90,11 +91,21 @@ export function usePresenceUpdater() {
       return status;
     };
 
+    // [Gitea #282] A one-off PUT /presence doesn't stick: the SDK long-polls
+    // /sync with set_presence=online by default and Synapse treats every sync
+    // as "online", so Invisible / Idle / DND flipped back within seconds. Tell
+    // the sync loop which presence to report too (as Element does).
+    const syncPresence = (presence: SetPresence) => {
+      mx.setSyncPresence(presence).catch(() => undefined);
+    };
+
     const setOnline = async () => {
+      syncPresence(SetPresence.Online);
       const status = await resolveStatus();
       return send({ presence: 'online', ...(status ? { status_msg: status } : {}) }, 'online');
     };
     const setUnavailable = async (statusMsg?: string) => {
+      syncPresence(SetPresence.Unavailable);
       const status = await resolveStatus();
       return send(
         {
@@ -104,7 +115,10 @@ export function usePresenceUpdater() {
         'unavailable',
       );
     };
-    const setOffline = () => send({ presence: 'offline', status_msg: '' }, 'offline');
+    const setOffline = () => {
+      syncPresence(SetPresence.Offline);
+      return send({ presence: 'offline', status_msg: '' }, 'offline');
+    };
 
     // Manual presence overrides — no activity tracking needed.
     if (hidePresence || presenceStatus === 'invisible') {