feat: namespaced localStorage store with export/import

src/core/store.js

@@ -0,0 +1,28 @@
+const PREFIX = 'gmd';
+
+export function createStore(namespace, storage = globalThis.localStorage) {
+  const full = (key) => `${PREFIX}.${namespace}.${key}`;
+  const nsPrefix = `${PREFIX}.${namespace}.`;
+  return {
+    get(key, fallback = null) {
+      const raw = storage.getItem(full(key));
+      if (raw == null) return fallback;
+      try { return JSON.parse(raw); } catch { return fallback; }
+    },
+    set(key, value) { storage.setItem(full(key), JSON.stringify(value)); },
+    remove(key) { storage.removeItem(full(key)); },
+    exportAll() {
+      const out = {};
+      for (let i = 0; i < storage.length; i++) {
+        const k = storage.key(i);
+        if (k && k.startsWith(nsPrefix)) out[k] = storage.getItem(k);
+      }
+      return out;
+    },
+    importAll(obj) {
+      for (const [k, v] of Object.entries(obj)) {
+        if (k.startsWith(nsPrefix)) storage.setItem(k, v);
+      }
+    },
+  };
+}