Prepare 2.1.20 Round 2 QA package

Ariver

2026-06-03 f66a79670c444010a59b8513c9f61257ebc7d9b6

 privatevoice.src/app.go

@@ -27,8 +27,8 @@
)

const (
   appVersion        = "2.1.19"
   appBuild          = "20260602.2022"
   appVersion        = "2.1.20"
   appBuild          = "20260603.1145"
   appDisplayVersion = appVersion + " (build " + appBuild + ")"
   appName           = "PrivateVoice Input"