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

package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "voiced",
-  "version": "1.0.2",
+  "version": "1.1.0",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "voiced",
-      "version": "1.0.2",
+      "version": "1.1.0",
       "dependencies": {
         "@carbon/icons-react": "^11.89.0",
         "@carbon/react": "^1.117.0",