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/preferences/wine_test.go

@@ -0,0 +1,97 @@
+// Copyright (c) 2026 Storm Dragon
+// Authors: Storm Dragon, Angus Kola
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package preferences
+
+import (
+	"reflect"
+	"strings"
+	"testing"
+
+	"git.stormux.org/storm/cthulhu/internal/config"
+)
+
+func TestWineValuesRoundTripAndOwnership(t *testing.T) {
+	settings := config.DefaultSettings()
+	settings.Wine = config.WineSettings{ControllerOnly: true, ExcludedPrograms: []string{"Game.exe", "Another Game.exe"}}
+	values := FromSettings(settings)
+	if !reflect.DeepEqual(values.Wine, settings.Wine) {
+		t.Fatalf("Wine values = %+v", values.Wine)
+	}
+	values.Wine.ExcludedPrograms[0] = "Changed.exe"
+	if settings.Wine.ExcludedPrograms[0] != "Game.exe" {
+		t.Fatal("FromSettings aliases the Wine program list")
+	}
+	values.Wine.ExcludedPrograms[0] = "Game.exe"
+	values.Wine.ControllerOnly = false
+	values.Wine.ExcludedPrograms = append(values.Wine.ExcludedPrograms, "New Game.exe")
+	merged, err := values.Merge(settings)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if got := FromSettings(merged); !reflect.DeepEqual(got, values) {
+		t.Fatalf("Wine values did not round trip:\n got %+v\nwant %+v", got.Wine, values.Wine)
+	}
+	values.Wine.ExcludedPrograms[0] = "Changed.exe"
+	if merged.Wine.ExcludedPrograms[0] != "Game.exe" {
+		t.Fatal("merged Wine programs alias the UI values")
+	}
+}
+
+func TestWineValuesMergeCollapsesCaseInsensitiveDuplicates(t *testing.T) {
+	settings := config.DefaultSettings()
+	values := FromSettings(settings)
+	values.Wine.ExcludedPrograms = []string{"Game.exe", "game.EXE", "Other.exe", "GAME.exe", "other.exe"}
+	merged, err := values.Merge(settings)
+	if err != nil {
+		t.Fatal(err)
+	}
+	want := []string{"Game.exe", "Other.exe"}
+	if !reflect.DeepEqual(merged.Wine.ExcludedPrograms, want) {
+		t.Fatalf("collapsed Wine programs = %q, want %q", merged.Wine.ExcludedPrograms, want)
+	}
+	values.Wine.ExcludedPrograms = nil
+	merged, err = values.Merge(settings)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if merged.Wine.ExcludedPrograms != nil {
+		t.Fatalf("empty Wine list became %q, want nil", merged.Wine.ExcludedPrograms)
+	}
+}
+
+func TestWineValuesMergeRejectsInvalidEntriesByName(t *testing.T) {
+	overlong := strings.Repeat("a", 252) + ".exe"
+	cases := []struct {
+		name    string
+		entry   string
+		wantSub string
+	}{
+		{name: "windows path", entry: `C:\Games\Game.exe`, wantSub: `C:\Games\Game.exe`},
+		{name: "unix path", entry: "Games/Game.exe", wantSub: "Games/Game.exe"},
+		{name: "blank", entry: "", wantSub: "blank"},
+		{name: "spaces only", entry: "   ", wantSub: "blank"},
+		{name: "overlong", entry: overlong, wantSub: overlong},
+		{name: "leading space", entry: " Game.exe", wantSub: "Game.exe"},
+		{name: "trailing space", entry: "Game.exe ", wantSub: "Game.exe"},
+	}
+	for _, test := range cases {
+		t.Run(test.name, func(t *testing.T) {
+			settings := config.DefaultSettings()
+			settings.Wine.ExcludedPrograms = []string{"Kept.exe"}
+			values := FromSettings(settings)
+			values.Wine.ExcludedPrograms = []string{"Kept.exe", test.entry}
+			merged, err := values.Merge(settings)
+			if err == nil {
+				t.Fatalf("Merge accepted Wine entry %q", test.entry)
+			}
+			if !strings.Contains(err.Error(), test.wantSub) {
+				t.Fatalf("Merge error %q does not name %q", err, test.wantSub)
+			}
+			if !reflect.DeepEqual(merged.Wine.ExcludedPrograms, []string{"Kept.exe"}) {
+				t.Fatalf("rejected Merge changed Wine programs to %q", merged.Wine.ExcludedPrograms)
+			}
+		})
+	}
+}