Implement self-update recovery (T-403)

app-modern/platform/windows/platform_stub.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"softbox.local/core/application/launch"
+	"softbox.local/core/updater"
 )
 
 type platformStub struct{}
@@ -39,3 +40,15 @@ func (platformStub) WaitForExit(context.Context, string, string, time.Duration)
 func (platformStub) Start(launch.Command) (int, error) {
 	return 0, ErrUnsupported
 }
+
+func (platformStub) WaitForProcessExit(context.Context, int, time.Duration) error {
+	return ErrUnsupported
+}
+
+func (platformStub) StartSelfUpdate(updater.StartCommand) (int, error) {
+	return 0, ErrUnsupported
+}
+
+func (platformStub) SyncDirectory(string) error {
+	return ErrUnsupported
+}