Simplify GUI settings and build flags

internal/app/guest_status_test.go

@@ -0,0 +1,58 @@
+package app
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+
+	"vrc_osc_go/internal/common"
+)
+
+func TestGuestTrackerJoinLeave(t *testing.T) {
+	base := t.TempDir()
+	prev := common.SetRootDirForTest(func() string { return base })
+	defer prev()
+
+	tracker := NewGuestTracker([]string{"Alice", "Bob"})
+	now := time.Date(2026, 6, 25, 12, 0, 0, 0, time.Local)
+
+	tracker.MarkJoin("Alice", now)
+	tracker.MarkJoin("Bob", now.Add(10*time.Second))
+
+	got := tracker.Snapshot(now.Add(20 * time.Second))
+	if len(got) != 2 {
+		t.Fatalf("expected 2 guests, got %d", len(got))
+	}
+
+	present := 0
+	for _, g := range got {
+		if g.Present {
+			present++
+		}
+	}
+	if present != 2 {
+		t.Fatalf("expected 2 present guests, got %#v", got)
+	}
+
+	tracker.MarkLeave("Alice", now.Add(30*time.Second))
+	got = tracker.Snapshot(now.Add(40 * time.Second))
+
+	var alice GuestStatus
+	for _, g := range got {
+		if g.Name == "Alice" {
+			alice = g
+		}
+	}
+	if alice.Present {
+		t.Fatalf("expected Alice to be absent, got %#v", alice)
+	}
+	if alice.AbsentFor == "" {
+		t.Fatalf("expected Alice absent duration, got %#v", alice)
+	}
+
+	snapshotPath := filepath.Join(base, "runtime", "guest_snapshot.json")
+	if _, err := os.Stat(snapshotPath); err != nil {
+		t.Fatalf("expected snapshot file: %v", err)
+	}
+}