bug(macos): WhatsApp reconnect flow on Mac (needs repro) #1346

Parent: #830 (chat leftovers, 9 Sep report). Needs repro. platform: macOS. Verified against main @ 8e39053.

Report

WhatsApp reconnection is confusing or broken on Mac.

What we know

• The reconnect logic is unchanged since the report: main/services/whatsapp.ts ~L915-945. A 401 (logged out) wipes the auth and forces a re-pair (new QR). Anything else auto-reconnects after RECONNECT_DELAY_MS.
• Commits touching whatsapp.ts since then (feat(reports): dispatch cash close via whatsapp #940, feat(settings): owner-only Offline mode that closes every optional outbound connection #1306 Offline mode, feat: add WhatsApp message templates, automated rules, and safety controls #1315, fix(main): harden WhatsApp offline abort, split-bill deduplication, loyalty rounding, and auto-settlement automation #1323) are not Mac-specific.

Steps to try (macOS, DMG and Mac App Store builds)

1. Pair, quit the app, reopen. Does it reconnect without a QR?
2. Pair, put the Mac to sleep for at least 10 minutes, then wake it.
3. Pair, then unlink the device from the phone. Is the re-pair QR shown clearly?
4. On the MAS build, check that auth files persist in the sandbox container.

Acceptance

• A repro and fix, plus a clear UI state for "reconnecting" vs "re-pair needed". Or cannot reproduce on 3.13.0, and close.