fix(03): update event lookup test mocks for CR-01/CR-02 query-chain changes

The CR-01 fix appended .orderBy().limit(1) to the edit/delete event lookups
and CR-02 added .innerJoin(calendars).limit(1) to the freshest-etag re-read.
The existing test doubles terminated the mock chain at .where(), so the new
chain calls hit undefined methods → handlers caught the throw and returned 503
(events.test.ts) and the worker skipped the PUT (outboxWorker.test.ts).

Extend the mocks to match the corrected production chains. Behaviour-preserving:
mockWhereCalEvents stays the awaited terminal so etag override assertions still drive.

8 failing tests now green; full suite: api 103, pwa 141.

apps/api/tests/broker/outboxWorker.test.ts

@@ -139,7 +139,15 @@ function wireMockChain() {
       return { where: vi.fn().mockResolvedValue([FAKE_CRED_ROW]) }
     }
     if (tableName === 'calendar_events') {
-      return { where: mockWhereCalEvents }
+      // CR-02: the freshest-etag re-read now scopes to the writing member's calendar:
+      //   .from(calendarEvents).innerJoin(calendars, ...).where(...).limit(1)
+      // mockWhereCalEvents stays the awaited terminal (returned by .limit) so existing
+      // mockWhereCalEvents.mockResolvedValue([{ etag }]) overrides still drive the etag.
+      return {
+        innerJoin: vi.fn().mockReturnValue({
+          where: vi.fn().mockReturnValue({ limit: mockWhereCalEvents }),
+        }),
+      }
     }
     return { where: mockWherePending }
   })