fix: a level set by the slider was lost when a recording started

The monitor followed the slider, but two takes made at 10% and 300% came out
identical: starting a recording re-reads the STORED settings and calls SetGains
with them, so the live value was overwritten the moment a take began.

The slider now persists as it applies. Saving Settings still works as before —
this only means the stored value is already right when a take starts, which is
what every path downstream reads.

app.go

@@ -8910,6 +8910,18 @@ func (a *App) DVKStop() {
 //
 // Persisting still happens on Save. This is the live half.
 func (a *App) AudioApplyLevels(fromPct, micPct int) {
+	// PERSIST as well as apply. Starting a recording re-reads the stored
+	// settings and calls SetGains with them, so a live-only value was thrown
+	// away the moment a take began: the monitor followed the slider while two
+	// recordings made at 10%% and 300%% came out identical.
+	if a.settings != nil {
+		if fromPct > 0 {
+			_ = a.settings.Set(a.ctx, keyAudioFromGain, strconv.Itoa(fromPct))
+		}
+		if micPct > 0 {
+			_ = a.settings.Set(a.ctx, keyAudioMicGain, strconv.Itoa(micPct))
+		}
+	}
 	if a.audioMgr != nil {
 		a.audioMgr.SetMonitorGain(fromPct)
 	}