Show TLS certificate validity details

Include healthy TLS certificate validity in website check messages and show latest website check results in the UI.

frontend/src/api/client.ts

@@ -1,5 +1,6 @@
 import type {
   Asset,
+  CheckResult,
   Incident,
   Monitor,
   MonitorUpdate,
@@ -82,6 +83,8 @@ export const api = {
     request<void>(`/monitors/${monitorId}`, token, {
       method: "DELETE",
     }),
+  monitorResults: (token: string, monitorId: number, limit = 1) =>
+    request<CheckResult[]>(`/monitors/${monitorId}/results?limit=${limit}`, token),
   incidents: (token: string) => request<Incident[]>("/incidents", token),
   acknowledgeIncident: (token: string, incidentId: number) =>
     request<Incident>(`/incidents/${incidentId}/acknowledge`, token, {