added openrouter ai generated tasks

lib/ai-habit-utils.ts

@@ -0,0 +1,56 @@
+import { isPlausibleTaskLabel } from "@/lib/ai-task-guardrails";
+
+export const AI_HABIT_NAME_PREFIX = "ai::";
+
+export function toStoredAiHabitName(label: string) {
+  return `${AI_HABIT_NAME_PREFIX}${label.trim()}`;
+}
+
+export function isAiGeneratedHabitName(name: string) {
+  return name.startsWith(AI_HABIT_NAME_PREFIX);
+}
+
+export function displayHabitName(name: string) {
+  return isAiGeneratedHabitName(name)
+    ? name.slice(AI_HABIT_NAME_PREFIX.length)
+    : name;
+}
+
+export function normalizeAiTaskLabel(label: string) {
+  return label.trim().replace(/\s+/g, " ").slice(0, 80);
+}
+
+export function sanitizeAiTaskLabels(
+  labels: unknown,
+  options?: { requirePlausible?: boolean },
+): string[] {
+  if (!Array.isArray(labels)) {
+    return [];
+  }
+
+  const seen = new Set<string>();
+
+  return labels
+    .filter((label): label is string => typeof label === "string")
+    .map(normalizeAiTaskLabel)
+    .filter((label) => label.length > 0)
+    .filter((label) => {
+      if (options?.requirePlausible && !isPlausibleTaskLabel(label)) {
+        return false;
+      }
+
+      const key = label.toLowerCase();
+
+      if (seen.has(key)) {
+        return false;
+      }
+
+      seen.add(key);
+      return true;
+    })
+    .slice(0, 5);
+}
+
+export function sanitizePlausibleAiTaskLabels(labels: unknown) {
+  return sanitizeAiTaskLabels(labels, { requirePlausible: true });
+}