Release 1.1.0

Version bump, the README line about units, and two new manual checks in the release checklist (export then New invoice
through the real save dialog, and units).

Claude-Session: https://claude.ai/code/session_01PZypiWDfMkDTeEPeXjRhW5

src-tauri/tauri.conf.json

@@ -1,7 +1,7 @@
 {
   "$schema": "https://schema.tauri.app/config/2",
   "productName": "Voiced",
-  "version": "1.0.2",
+  "version": "1.1.0",
   "identifier": "com.bongbetic.voiced",
   "build": {
     "beforeDevCommand": "npm run dev",