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/README.md

@@ -3,11 +3,15 @@
 Electron shell that loads the live Connect web UI and adds native screen capture. See the
 overall plan in [../CLIENTS.md](../CLIENTS.md).
 
-## Run (dev)
+## Run (dev = local testing)
 ```bash
 npm install
-SERVER_URL=http://localhost:8090 npm start     # default is https://remote.bizgaze.com
+npm start                                   # dev auto-targets http://localhost:8090 (your local server)
+SERVER_URL=https://remote.bizgaze.com npm start   # …or point dev at production to compare
 ```
+`npm start` IS the local desktop test — no separate "local" installer needed. In dev (unpackaged)
+the shell defaults to the local server; a PACKAGED installer defaults to production. `SERVER_URL`
+overrides either. (Bash/Git-Bash syntax above; in PowerShell: `$env:SERVER_URL='…'; npm start`.)
 
 ## Build installers
 ```bash