feat: persist settings and enrich conversation context

tests/web/reddit-identities.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, it } from 'vitest';
+import { presentActivityItem, resolveRedditUsername } from '../../src/web/reddit-identities.js';
+
+const resolver = {
+  resolveSenderDisplay(identity: string) {
+    return identity.replace(/^@?t2_known(?::reddit\.com)?$/, 'alice');
+  },
+};
+
+describe('Reddit identity presentation', () => {
+  it('resolves internal ids and rejects unresolved ids', () => {
+    expect(resolveRedditUsername('@t2_known:reddit.com', resolver)).toBe('alice');
+    expect(resolveRedditUsername('t2_missing', resolver)).toBeNull();
+  });
+
+  it('upgrades both the activity recipient and its persisted message text', () => {
+    expect(presentActivityItem({
+      timestamp: 1,
+      type: 'response',
+      message: 'Reply from u/t2_known',
+      recipient: 't2_known',
+    }, resolver)).toEqual({
+      timestamp: 1,
+      type: 'response',
+      message: 'Reply from u/alice',
+      recipient: 'alice',
+    });
+  });
+
+  it('redacts unresolved ids instead of exposing them', () => {
+    const item = presentActivityItem({
+      timestamp: 1,
+      type: 'response',
+      message: 'Reply from @t2_missing:reddit.com',
+      recipient: 't2_missing',
+    }, resolver);
+
+    expect(item.message).toBe('Reply from Reddit user');
+    expect(item.recipient).toBeUndefined();
+  });
+});