feat: live presence, delivery-tick sync, brand rollout, call fixes, desktop 0.1.3

Live presence (fixes stale in-call/status until refresh — impossible in apps):
- server broadcasts a user's status over the chat socket on connect/disconnect, call
  join/leave, and status change (chat.js broadcastPresence; signaling + routes hooks).
- client onPresence() updates the contact dot + open-chat header live.

Chat delivery ticks (#6): chat-list row now mirrors the thread (delivered→double grey,
read→blue) via a new 'with' field on the delivered relay + onChatRead/onChatDelivered.

Call fixes: no bogus 'host handed over' when a 1:1 call ends (leaveMeeting forced);
branded call-connecting + chat-thread loaders; header subtitle tracks live call state.

Notifications: web notify + sw.js use sender/group DP + brand icon (not old wordmark);
desktop shell drops Web Push so only the single native toast fires (#5).

Brand: master icon/splash/loaders wired everywhere (PWA/favicon/apple-touch/.ico),
branded login (blue + gold CTA), branded toasts (BZToast) on all pages, Electron splash.

Desktop: dev auto-targets localhost (packaged→prod); version 0.1.3 with new multi-size
icon; dropped unused node-notifier; removed home-mockup.html.

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

desktop/package.json

@@ -1,6 +1,6 @@
 {
   "name": "biz-connect-desktop",
-  "version": "0.1.2",
+  "version": "0.1.3",
   "description": "Biz Connect technician desktop client — loads the Connect web UI with native screen capture",
   "author": {
     "name": "BizGaze",
@@ -12,8 +12,7 @@
     "dist": "electron-builder"
   },
   "dependencies": {
-    "electron-updater": "^6.3.9",
-    "node-notifier": "^10.0.1"
+    "electron-updater": "^6.3.9"
   },
   "devDependencies": {
     "electron": "^31.0.0",
@@ -26,9 +25,6 @@
       "buildResources": "build",
       "output": "dist"
     },
-    "asarUnpack": [
-      "**/node_modules/node-notifier/**"
-    ],
     "publish": [
       {
         "provider": "generic",