Add global Wine preferences tab

Phase 3 of the Wine/Proton stage (decisions 6, 9, 13, 19 in docs/testing/wine-proton.md): a global-only Wine tab modeled on the Pronunciation page, with the controller-only checkbox and a typed editable program list. Wine values flow through the preferences protocol so a global Apply reaches the live Wine settings from Phase 2 with no reader restart. Entries are validated as edited and named in-tab, blocking Apply until fixed; case-insensitive duplicates collapse. Per-application preferences expose no Wine editing and an app-scoped Apply cannot change the governing list.

internal/app/preferences_apply.go

@@ -34,6 +34,14 @@ func (worker *preferencesWorker) apply(ctx context.Context, request preferences.
 	if worker.editingActive {
 		base = worker.editing
 	}
+	if worker.editingActive && worker.editApp != "" {
+		// Wine settings are global-only and the Wine tab is absent from
+		// application preferences, so an application-scoped Apply never
+		// edits them: the base values pass through unchanged and only a
+		// global Apply can republish the governing Wine list.
+		request.Values.Wine = config.WineSettings{ControllerOnly: base.Wine.ControllerOnly,
+			ExcludedPrograms: append([]string(nil), base.Wine.ExcludedPrograms...)}
+	}
 	next, err := request.Values.Merge(base)
 	if err != nil {
 		return worker.response("Settings were not applied: "+err.Error(), false)