Build browser-native Super Testnet v0 inscription loop

src/storage.js

@@ -0,0 +1,18 @@
+import { LocalChain } from './adapters/chain.js';
+import { TestWallet, NETWORK } from './adapters/wallet.js';
+export const STORAGE_KEY = 'super-testnet:lab:v1';
+export function decodeLab(raw) {
+  if (!raw) return { wallet: null, chain: new LocalChain() };
+  const data = JSON.parse(raw);
+  if (data.kind !== 'test-lab' || data.network !== NETWORK || data.version !== 1) throw new Error('Unsupported lab backup.');
+  return { wallet: data.wallet ? TestWallet.load(data.wallet) : null, chain: new LocalChain(data.chain) };
+}
+export const encodeLab = lab => JSON.stringify({
+  kind: 'test-lab', network: NETWORK, version: 1,
+  wallet: lab.wallet?.backup() ?? null, chain: lab.chain.snapshot(),
+});
+export const readLab = () => decodeLab(localStorage.getItem(STORAGE_KEY));
+export function saveLab(lab) {
+  try { localStorage.setItem(STORAGE_KEY, encodeLab(lab)); }
+  catch { throw new Error('Browser storage is full or unavailable. No changes were saved. Export a lab backup before clearing storage.'); }
+}