Improve UI views for assets/components/failures and timeline details

internal/ingest/service_observation_test.go

@@ -3,6 +3,7 @@ package ingest
 import (
 	"encoding/json"
 	"testing"
+	"time"
 )
 
 func TestObservationDetailsPayloadIncludesStatusCheckedAt(t *testing.T) {
@@ -64,3 +65,40 @@ func TestObservationDetailsPayloadIncludesStatusCheckedAt(t *testing.T) {
 		t.Fatalf("error_description = %v, want %v", gotErr, errorDescription)
 	}
 }
+
+func TestParseComponentStatusEventTime(t *testing.T) {
+	explicit := "2026-02-10T15:22:00Z"
+	component := HardwareComponent{
+		Status:          statusCritical,
+		StatusChangedAt: &explicit,
+		StatusHistory: []HardwareStatusHistoryEntry{
+			{Status: "OK", ChangedAt: "2026-02-10T15:10:00Z"},
+			{Status: "CRITICAL", ChangedAt: "2026-02-10T15:18:00Z"},
+		},
+	}
+
+	actual := parseComponentStatusEventTime(component)
+	if actual == nil {
+		t.Fatalf("parseComponentStatusEventTime() = nil, want non-nil")
+	}
+	want, _ := time.Parse(time.RFC3339, explicit)
+	if !actual.Equal(want.UTC()) {
+		t.Fatalf("parseComponentStatusEventTime() = %s, want %s", actual.UTC().Format(time.RFC3339), want.UTC().Format(time.RFC3339))
+	}
+}
+
+func TestTimelineFallbackTime(t *testing.T) {
+	actual, _ := time.Parse(time.RFC3339, "2026-02-10T15:22:00Z")
+	collected, _ := time.Parse(time.RFC3339, "2026-02-10T15:30:00Z")
+	ingested, _ := time.Parse(time.RFC3339, "2026-02-10T15:40:00Z")
+
+	if got := timelineFallbackTime(&actual, collected, ingested); !got.Equal(actual.UTC()) {
+		t.Fatalf("timelineFallbackTime(actual, collected, ingested) = %s, want %s", got.Format(time.RFC3339), actual.UTC().Format(time.RFC3339))
+	}
+	if got := timelineFallbackTime(nil, collected, ingested); !got.Equal(collected.UTC()) {
+		t.Fatalf("timelineFallbackTime(nil, collected, ingested) = %s, want %s", got.Format(time.RFC3339), collected.UTC().Format(time.RFC3339))
+	}
+	if got := timelineFallbackTime(nil, time.Time{}, ingested); !got.Equal(ingested.UTC()) {
+		t.Fatalf("timelineFallbackTime(nil, zero, ingested) = %s, want %s", got.Format(time.RFC3339), ingested.UTC().Format(time.RFC3339))
+	}
+}