fix: login submits on Enter (real <form>) + desktop notifications show "Biz Connect"

- home.html: login is now a real <form> with a submit button, so Enter (or click) both
  submit natively — replaces the ad-hoc keydown handler. (build batch19; header stays removed)
- desktop/main.js: app.setAppUserModelId('com.bizgaze.connect.desktop') so Windows resolves
  the installed shortcut and toasts read "Biz Connect" instead of "electron.app.BizConnect".
- desktop version → 0.1.1; installer rebuilt.

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

desktop/package.json

@@ -1,6 +1,6 @@
 {
   "name": "biz-connect-desktop",
-  "version": "0.1.0",
+  "version": "0.1.1",
   "description": "Biz Connect technician desktop client — loads the Connect web UI with native screen capture",
   "author": { "name": "BizGaze", "email": "support@bizgaze.com" },
   "main": "main.js",