v1.2 scaffold

frontend/src/lib/session.ts

@@ -0,0 +1,58 @@
+import { browser } from '$app/environment';
+import { writable } from 'svelte/store';
+
+export type OperatorSession = {
+  name: string;
+  email: string;
+  role: string;
+};
+
+const STORAGE_KEY = 'data-entry-app-operator-session';
+
+function readSession(): OperatorSession | null {
+  if (!browser) {
+    return null;
+  }
+
+  const value = localStorage.getItem(STORAGE_KEY);
+  if (!value) {
+    return null;
+  }
+
+  try {
+    return JSON.parse(value) as OperatorSession;
+  } catch {
+    localStorage.removeItem(STORAGE_KEY);
+    return null;
+  }
+}
+
+function createOperatorSessionStore() {
+  const store = writable<OperatorSession | null>(readSession());
+
+  if (browser) {
+    window.addEventListener('storage', (event) => {
+      if (event.key === STORAGE_KEY) {
+        store.set(readSession());
+      }
+    });
+  }
+
+  return {
+    subscribe: store.subscribe,
+    set(session: OperatorSession) {
+      if (browser) {
+        localStorage.setItem(STORAGE_KEY, JSON.stringify(session));
+      }
+      store.set(session);
+    },
+    clear() {
+      if (browser) {
+        localStorage.removeItem(STORAGE_KEY);
+      }
+      store.set(null);
+    }
+  };
+}
+
+export const operatorSession = createOperatorSessionStore();