release: v4.9.0 — full redesign + reworked offline mode

Ground-up visual redesign across the entire surface (landing, connection
setup, chat header, security verification report, file transfer, PWA
install/update/offline dialogs).

Offline reworked: store-and-forward queue (send while offline → queued,
delivered on reconnect), WhatsApp-style per-message delivery status
(sending/sent/delivered/not-sent) via delivery receipts, offline buffering
for messages to an offline peer, and offline state no longer leaking into
the connection indicator. Resilient chunked file transfer with retransmission
and auto-save. README + screenshots added.

src/scripts/app-boot.js

@@ -8,10 +8,8 @@ import '../components/ui/Header.jsx';
 import '../components/ui/DownloadApps.jsx';
 import '../components/ui/BecomePartner.jsx';
 import '../components/ui/UniqueFeatureSlider.jsx';
-import '../components/ui/SecurityFeatures.jsx';
-import '../components/ui/Testimonials.jsx';
-import '../components/ui/ComparisonTable.jsx';
 import '../components/ui/Roadmap.jsx';
+import '../components/ui/CommunityCTA.jsx';
 import '../components/ui/FileTransfer.jsx';
 import '../components/ui/IceServerSettings.jsx';