Add WebDAV sync provider (manual + auto-sync, top-bar button)

src/lib/api.ts

@@ -327,6 +327,28 @@ export async function setBackupSettings(
   });
 }
 
+// ── Sync (WebDAV) ──
+
+export async function setSyncSettings(
+  provider: string | null,
+  url: string | null,
+  username: string | null,
+  password: string | null,
+  syncOnOpen: boolean,
+  syncOnChange: boolean,
+  syncIntervalMinutes: number,
+): Promise<void> {
+  return invoke("set_sync_settings", { provider, url, username, password, syncOnOpen, syncOnChange, syncIntervalMinutes });
+}
+
+export async function testSyncConnection(): Promise<void> {
+  return invoke("test_sync_connection");
+}
+
+export async function syncNow(): Promise<void> {
+  return invoke("sync_now");
+}
+
 // ── Version History ──
 
 export async function getNoteVersions(noteId: string): Promise<VersionEntry[]> {