feat: name the account the tray's unread list is from when several are signed in

lib/desktop/__tests__/os-window.test.tsx

@@ -490,6 +490,18 @@ describe('the summary', () => {
       expect(summary.unread).toEqual([expect.objectContaining({ emailId: 'e1', accountId: 'acc', sender: 'Alice', subject: 'Lunch?' })]);
       expect(JSON.parse(summary.unread[0].context!)).toMatchObject({ emailId: 'e1', slot: 3 });
       expect(getEmails).toHaveBeenCalledWith('in', undefined, 5, 0, undefined, false, { notKeyword: '$seen' });
+      // One account: no need to say whose.
+      expect(summary.account).toBeUndefined();
+    });
+
+    it('with two accounts it names the one the unread mail is from', async () => {
+      const { useAccountStore } = await import('@/stores/account-store');
+      useAccountStore.setState({ accounts: [
+        { id: 'alice@one', cookieSlot: 3, serverUrl: 'https://one.example', username: 'alice@example.org' },
+        { id: 'bob@two', cookieSlot: 4, serverUrl: 'https://two.example', username: 'bob@example.org' },
+      ] as never });
+      const { readSummary } = await import('../os-summary');
+      expect((await readSummary('en')).account).toBe('alice@example.org');
     });
 
     it('before the policy is known it is empty', async () => {

lib/desktop/os-summary.ts

@@ -81,7 +81,9 @@ export async function readSummary(locale: string | undefined, now = Date.now()):
     const next = nextEventOf(events, now);
     if (next) nextEvent = { title: next.title ?? '', when: formatEventTime(eventStart(next), now, locale) };
   }
-  return { unread, recent, nextEvent };
+  // The tray lists one account's inbox: with more than one, it says whose.
+  const several = useAccountStore.getState().accounts.length > 1;
+  return { unread, recent, nextEvent, ...(several && entry.username ? { account: entry.username } : {}) };
 }
 
 /** Keeps main's copy current: when the unread count moves, and now and then for the next event. */

lib/desktop/types.ts

@@ -610,6 +610,8 @@ export interface DesktopOsSummary {
   /** Newest conversations, whether read or not, for the jump list. */
   recent: DesktopOsTrayMessage[];
   nextEvent: { title: string; when: string } | null;
+  /** The account `unread` is from, when more than one is signed in. */
+  account?: string;
 }
 
 export type DesktopOsPowerEvent = 'suspend' | 'resume' | 'lock-screen' | 'unlock-screen';