feat: NIP-AB device pairing — Phase 2 (desktop + mobile UI) (#343)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

desktop/src/shared/api/tauri.ts

@@ -1091,3 +1091,17 @@ export async function probeBackendProvider(
     binaryPath,
   });
 }
+
+// ── NIP-AB device pairing ───────────────────────────────────────────────────
+
+export async function startPairing(): Promise<string> {
+  return invokeTauri<string>("start_pairing");
+}
+
+export async function confirmPairingSas(): Promise<void> {
+  await invokeTauri("confirm_pairing_sas");
+}
+
+export async function cancelPairing(): Promise<void> {
+  await invokeTauri("cancel_pairing");
+}