fix: apply unread/starred filters in mailbox queries

src/api/__tests__/email.test.ts

@@ -90,6 +90,24 @@ describe('email operations', () => {
       const call = mockRequest.mock.calls[0][0][0];
       expect(call[1].filter).toEqual({ inMailbox: 'mb-1', hasKeyword: '$flagged' });
     });
+
+    it('should AND-wrap a FilterOperator instead of spreading it', async () => {
+      mockRequest.mockResolvedValue({
+        methodResponses: [['Email/query', { ids: [], total: 0 }, '0']],
+      });
+
+      const userFilter = {
+        operator: 'AND',
+        conditions: [{ inMailbox: 'mb-1' }, { notKeyword: '$seen' }],
+      };
+      await queryEmails('mb-1', { filter: userFilter });
+
+      const call = mockRequest.mock.calls[0][0][0];
+      expect(call[1].filter).toEqual({
+        operator: 'AND',
+        conditions: [{ inMailbox: 'mb-1' }, userFilter],
+      });
+    });
   });
 
   describe('getEmails', () => {

src/api/email.ts

@@ -93,10 +93,22 @@ export async function queryEmails(
   },
 ): Promise<{ ids: string[]; total: number }> {
   const accountId = jmapClient.accountId;
+  const inMailbox = { inMailbox: mailboxId };
+  const userFilter = options?.filter;
+  // JMAP filters are either a FilterCondition or a FilterOperator (operator +
+  // conditions) — never both. Spreading a FilterOperator next to `inMailbox`
+  // produces a hybrid object that servers reduce to the FilterCondition,
+  // silently dropping the operator's conditions (e.g. the "unread" toggle).
+  const filter =
+    !userFilter || Object.keys(userFilter).length === 0
+      ? inMailbox
+      : 'operator' in userFilter
+        ? { operator: 'AND', conditions: [inMailbox, userFilter] }
+        : { ...inMailbox, ...userFilter };
   const res = await jmapClient.request([
     ['Email/query', {
       accountId,
-      filter: { inMailbox: mailboxId, ...options?.filter },
+      filter,
       sort: options?.sort ?? [{ property: 'receivedAt', isAscending: false }],
       position: options?.position ?? 0,
       limit: options?.limit ?? 50,