fix(bot): revert qrTimeout — keep Baileys' native 60/20s rotation

The earlier "QR refreshes every 5 s" bug was the session-manager
auto-reconnect loop (commit 4d10c72), not the QR cadence. Baileys'
default QR rotation (60 s first ref, then ~20 s per subsequent ref) is
the correct native behaviour — each rotation just refreshes the
displayed QR via SSE. Forcing qrTimeout=60s suppressed those legitimate
rotations and made the QR feel stuck.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/bot/src/whatsapp/session.ts

@@ -46,11 +46,11 @@ export async function startSession(params: {
     auth: state,
     browser: Browsers.macOS("Safari"),
     syncFullHistory: false,
-    // Default: 60 s for the first QR, 20 s for subsequent ones (~5 refs ≈
-    // 2.5 min total before Baileys gives up). Set both legs to 60 s so
-    // the operator has the full ~5 min pairing window to scan, matching
-    // pair-handler's PAIR_TIMEOUT_MS.
-    qrTimeout: 60_000,
+    // Use Baileys' default QR cadence (60 s for the first ref, ~20 s for
+    // each subsequent ref) — that's the native WhatsApp Web cadence and
+    // each rotation just refreshes the displayed QR. The earlier "QR
+    // refresh every 5 s" bug was the session-manager reconnect loop,
+    // not the cadence.
     logger: logger.child({ accountId, component: "baileys" }) as never,
   });