feat(push): bundle a custom notification sound (notif.wav) for chat + calls

Notifications were silent despite the payload requesting sound:'default' and correct
device settings. Ship an explicit tone: a generated PCM .wav is bundled into the app
(ios-patch.sh copies it in; add-share-extension.rb adds it to the App target's Copy
Bundle Resources, tolerantly) and the server now sends sound:'notif.wav'. Part of the
consolidated iOS build alongside the background-audio + call-push + AppDelegate fixes.

Only affects iOS-native-app tokens (currently just the one test device); web push
ignores the field. Needs a fresh Codemagic build for the bundled file to exist.

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

server/push.js

@@ -88,7 +88,9 @@ function sendApns(token, payload) {
     let client;
     try { client = http2.connect(apnsCfg.host); } catch (_) { return resolve({}); }
     client.on('error', () => { try { client.close(); } catch (_) {} resolve({}); });
-    const body = JSON.stringify({ aps: { alert: { title: payload.title || 'Biz Connect', body: payload.body || '' }, sound: 'default' }, ...(payload.data || {}) });
+    // Custom bundled sound (notif.wav, shipped in the app via ios-patch.sh + add-share-extension.rb) gives
+    // chat/call notifications an explicit, distinctive tone. A call site may override via payload.sound.
+    const body = JSON.stringify({ aps: { alert: { title: payload.title || 'Biz Connect', body: payload.body || '' }, sound: payload.sound || 'notif.wav' }, ...(payload.data || {}) });
     const req = client.request({ ':method': 'POST', ':path': '/3/device/' + token, authorization: 'bearer ' + apnsToken(), 'apns-topic': apnsCfg.bundle, 'apns-push-type': 'alert' });
     let status = 0;
     req.on('response', (h) => { status = h[':status']; });