Ship Tier A Week 1–2: posture glossary, delivery mode, freshness UI, canonical tokens.

Expose mission-control mode on home/bridge/analytics, quiet-chain freshness copy, and a canonical-first indexed token list with WETH9 metadata override and non-canonical warnings.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/api/track1/bridge_mode_test.go

@@ -0,0 +1,36 @@
+package track1
+
+import (
+	"testing"
+
+	"github.com/explorer/backend/api/freshness"
+	"github.com/stretchr/testify/require"
+)
+
+func TestResolveBridgeDeliveryModeLiveWithoutRelays(t *testing.T) {
+	got := resolveBridgeDeliveryMode(false, nil, freshness.CompletenessComplete)
+	require.Equal(t, "live", got.Kind)
+	require.Nil(t, got.Reason)
+}
+
+func TestResolveBridgeDeliveryModeSnapshotWithRelays(t *testing.T) {
+	got := resolveBridgeDeliveryMode(true, nil, freshness.CompletenessComplete)
+	require.Equal(t, "snapshot", got.Kind)
+	require.Equal(t, "live_homepage_stream_not_attached", got.Reason)
+	require.Equal(t, "relay_monitoring_homepage_card_only", got.Scope)
+}
+
+func TestResolveBridgeDeliveryModeMixedWhenTransactionVisibilityStale(t *testing.T) {
+	diagnostics := &freshness.Diagnostics{
+		ActivityState: "fresh_head_stale_transaction_visibility",
+	}
+	got := resolveBridgeDeliveryMode(true, diagnostics, freshness.CompletenessPartial)
+	require.Equal(t, "mixed", got.Kind)
+	require.Equal(t, "relay_snapshot_only_source", got.Reason)
+	require.Equal(t, "bridge_monitoring_and_homepage", got.Scope)
+}
+
+func TestIsStaleTransactionVisibility(t *testing.T) {
+	require.True(t, isStaleTransactionVisibility(&freshness.Diagnostics{ActivityState: "fresh_head_stale_transaction_visibility"}))
+	require.False(t, isStaleTransactionVisibility(&freshness.Diagnostics{ActivityState: "healthy"}))
+}