Record Round 5 QA and harden model downloads

Ariver

2026-06-03 e1c362699c9a545b9db99130424f5f32d20723c4

 privatevoice.src/app.go

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

const (
   appVersion        = "2.1.21"
   appBuild          = "20260603.1327"
   appVersion        = "2.1.22"
   appBuild          = "20260603.1608"
   appDisplayVersion = appVersion + " (build " + appBuild + ")"
   appName           = "PrivateVoice Input"