feat: harden portfolio and add SEO foundations

lib/project-health.ts

@@ -14,45 +14,19 @@ export interface ProjectHealthSnapshot {
   projects: Record<string, ProjectHealthCheck>;
 }
 
-interface ProjectLike {
-  id: string;
-  featured?: boolean;
-}
+export type DemoAvailability = "available" | "unavailable" | "unknown" | "none";
 
-function isFresh(checkedAt: string, now: Date) {
-  const timestamp = Date.parse(checkedAt);
-  return (
-    Number.isFinite(timestamp) &&
-    now.getTime() - timestamp <= PROJECT_HEALTH_MAX_AGE_MS
-  );
-}
-
-export function isCurrentLiveCheck(
+export function getDemoAvailability(
+  demoUrl: string | null | undefined,
   check: ProjectHealthCheck | undefined,
-  now = new Date(),
-) {
-  return Boolean(
-    check &&
-      check.status === 200 &&
-      check.contentType?.toLowerCase().startsWith("text/html") &&
-      isFresh(check.checkedAt, now),
-  );
-}
-
-export function filterLiveProjects<T extends ProjectLike>(
-  projects: T[],
-  snapshot: ProjectHealthSnapshot | null,
-  now = new Date(),
-) {
-  if (!snapshot || !isFresh(snapshot.checkedAt, now)) {
-    return [] as T[];
-  }
-
-  return projects.filter(
-    (project) =>
-      project.featured !== false &&
-      isCurrentLiveCheck(snapshot.projects[project.id], now),
-  );
+): DemoAvailability {
+  if (!demoUrl) return "none";
+  if (!check) return "unknown";
+  if (check.error || check.status === null) return "unknown";
+  return check.status === 200 &&
+    check.contentType?.split(";", 1)[0].trim().toLowerCase() === "text/html"
+    ? "available"
+    : "unavailable";
 }
 
 interface ProjectDemo {
@@ -67,7 +41,10 @@ interface HealthResponse {
   body?: { cancel?: () => unknown } | null;
 }
 
-type HealthFetcher = (url: string, init: RequestInit) => Promise<HealthResponse>;
+type HealthFetcher = (
+  url: string,
+  init: RequestInit,
+) => Promise<HealthResponse>;
 
 export async function createProjectHealthSnapshot(
   projects: ProjectDemo[],
@@ -101,7 +78,8 @@ export async function createProjectHealthSnapshot(
             status: null,
             contentType: null,
             checkedAt,
-            error: error instanceof Error ? error.message : "Health check failed",
+            error:
+              error instanceof Error ? error.message : "Health check failed",
           },
         ] as const;
       }