feat: add auto sync database list handling and notifications for missing entries

src/utils/frontmatter.ts

@@ -0,0 +1,52 @@
+export const AUTO_SYNC_DATABASE_KEY = "aytosync-database";
+
+function toCandidateList(value: unknown): string[] {
+    if (Array.isArray(value)) {
+        return value.map(item => String(item ?? "").trim());
+    }
+
+    if (typeof value === "string") {
+        if (value.includes(",")) {
+            return value.split(",").map(item => item.trim());
+        }
+        return [value.trim()];
+    }
+
+    return [];
+}
+
+export function parseAutoSyncDatabaseList(value: unknown): string[] {
+    const candidates = toCandidateList(value)
+        .map(name => name.replace(/^\[|\]$/g, "").trim()) // strip stray brackets
+        .filter(Boolean);
+
+    const seen = new Map<string, string>();
+    for (const name of candidates) {
+        const key = name.toLowerCase();
+        if (!seen.has(key)) {
+            seen.set(key, name);
+        }
+    }
+
+    return Array.from(seen.values());
+}
+
+export function ensureAutoSyncDatabaseEntry(value: unknown, abName: string): string[] {
+    const current = parseAutoSyncDatabaseList(value);
+    const lower = abName.toLowerCase();
+
+    let contains = false;
+    const updated = current.map(name => {
+        if (name.toLowerCase() === lower) {
+            contains = true;
+            return abName;
+        }
+        return name;
+    });
+
+    if (!contains) {
+        updated.push(abName);
+    }
+
+    return updated;
+}