Read Wine settings live at poll and spawn

Phase 2 of the Wine/Proton stage (decisions 3, 4, 16, 17, 19 in docs/testing/wine-proton.md): replace the Wine manager's startup snapshot with a live settings source read once per poll, so accepted global settings take effect with no reader restart. The source publishes only the active/global profile's Wine values; per-application profile switching never changes the governing list. A newly listed running program restarts its helper once in the same mode; removals and clearing the global switch never downgrade a running helper.

internal/app/preferences.go

@@ -84,6 +84,17 @@ type preferencesWorker struct {
 	readSpeechDefaults  func(context.Context, string) (speech.Settings, error)
 }
 
+// setGlobalSettings records a new active/global profile and republishes
+// its global-only Wine values for the Wine manager. Per-application
+// settings are cached separately and never pass through here, so focus
+// changes cannot change the governing Wine list.
+func (worker *preferencesWorker) setGlobalSettings(settings config.Settings) {
+	worker.globalSettings = settings
+	if worker.live != nil {
+		worker.live.StoreGlobalWine(settings.Wine)
+	}
+}
+
 func newPreferencesWorker(logger *slog.Logger, settings config.Settings, updater any) *preferencesWorker {
 	return &preferencesWorker{logger: logger, settings: settings, globalSettings: settings, appSettings: make(map[string]config.Settings), updater: updater,
 		extensionRequests: make(chan readerSettingsCall, 16), extensions: make(map[string]*readerExtension), speechCommands: make(chan input.Command, 16), remoteChanges: make(chan remoteSettingsChange, 16), discover: speech.Discover, readSpeechDefaults: speech.ReadDefaults, open: make(chan string, 1), applicationChanges: make(chan string, 1), done: make(chan struct{})}