feat: warn on uncertain episode availability

internal/playback/watch_data_test.go

@@ -1,7 +1,9 @@
 package playback
 
 import (
+	"mal/internal/domain"
 	"testing"
+	"time"
 )
 
 func TestFallbackModes(t *testing.T) {
@@ -33,3 +35,57 @@ func TestFallbackModes(t *testing.T) {
 		})
 	}
 }
+
+func TestEpisodeAvailabilityWarning(t *testing.T) {
+	now := time.Date(2026, time.June, 27, 11, 0, 0, 0, time.UTC)
+	tests := []struct {
+		name string
+		list domain.CanonicalEpisodeList
+		want string
+	}{
+		{
+			name: "fresh availability does not warn",
+			list: domain.CanonicalEpisodeList{
+				Episodes:      []domain.CanonicalEpisode{{Number: 1, HasSub: true}},
+				LastSuccessAt: "2026-06-27T10:00:00Z",
+				NextRefreshAt: "2026-06-27T12:00:00Z",
+			},
+		},
+		{
+			name: "stale availability warns",
+			list: domain.CanonicalEpisodeList{
+				Episodes:      []domain.CanonicalEpisode{{Number: 1, HasSub: true}},
+				LastSuccessAt: "2026-06-27T09:00:00Z",
+				NextRefreshAt: "2026-06-27T10:00:00Z",
+			},
+			want: episodeAvailabilityUncertainWarning,
+		},
+		{
+			name: "retrying availability warns",
+			list: domain.CanonicalEpisodeList{
+				Episodes:      []domain.CanonicalEpisode{{Number: 1, HasSub: true}},
+				NextRefreshAt: "2026-06-27T11:05:00Z",
+				RetryUntilAt:  "2026-06-27T11:30:00Z",
+				FailureCount:  1,
+			},
+			want: episodeAvailabilityUncertainWarning,
+		},
+		{
+			name: "failed availability warns",
+			list: domain.CanonicalEpisodeList{
+				Episodes:     []domain.CanonicalEpisode{{Number: 1, HasSub: true}},
+				FailureCount: 3,
+			},
+			want: episodeAvailabilityUncertainWarning,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got := episodeAvailabilityWarning(tt.list, now)
+			if got != tt.want {
+				t.Fatalf("episodeAvailabilityWarning() = %q, want %q", got, tt.want)
+			}
+		})
+	}
+}