fix(13-02): eliminate all ESLint violations — pnpm lint exits 0

- eslint.config.js: disable React Compiler rules (v7 flat.recommended enables
  them; codebase does not use the Compiler); add e2e/ to disableTypeChecked
  block; promote exhaustive-deps to error
- API broker: remove redundant as-casts (outboxWorker, poller, reminderScheduler,
  expand, sync, vevent, spike); add targeted ical.js no-unsafe-assignment/argument
  disables with justifying comments inside try blocks
- API routes/sse.ts: fix no-misused-promises on async writeSSE callback with
  void+IIFE+catch pattern
- API routes/lists.ts: let → const for updateValues
- API tests: remove unused imports (beforeEach, eq, vi); rename unused vars
  with _ prefix; remove unused lastActiveId assignment
- PWA components: void navigate() and void queryClient.invalidateQueries() on
  all fire-and-forget call sites; fix CalendarShell explicit-type-casts;
  Couldn't → HTML entity
- PWA test files: as unknown as Response for partial mock objects; string | null
  type annotation on mockLastSyncedUid; remove async from test callbacks without
  await; act(() => {}) not await act(async () => {}) for sync ops
- sw.ts: restructure Notification.data?.url access as let+if so disable
  comments land on the exact violation lines; void self.skipWaiting()

apps/pwa/src/routes/ListDetail.test.tsx

@@ -11,8 +11,8 @@
  * Uses React Query's QueryClient directly (no mocked server).
  */
 
-import { describe, it, expect, vi, beforeEach } from 'vitest'
-import { renderHook, act } from '@testing-library/react'
+import { describe, it, expect, beforeEach } from 'vitest'
+import { act } from '@testing-library/react'
 import { QueryClient } from '@tanstack/react-query'
 import type { ListItem, ListItemsResponse } from '../api/listsClient.js'
 
@@ -80,7 +80,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
     expect(updated?.items[0].checked).toBe(false)
   })
 
-  it('rolls back the checked state if the server PATCH returns an error', async () => {
+  it('rolls back the checked state if the server PATCH returns an error', () => {
     const item = makeItem({ checked: false })
     queryClient.setQueryData<ListItemsResponse>(['list', LIST_ID], makeItemsResponse([item]))
 
@@ -88,7 +88,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
     const previous = queryClient.getQueryData<ListItemsResponse>(['list', LIST_ID])
 
     // Step 2: apply optimistic update
-    await act(async () => {
+    act(() => {
       queryClient.setQueryData<ListItemsResponse>(['list', LIST_ID], (old) => ({
         items: (old?.items ?? []).map((i) =>
           i.id === item.id ? { ...i, checked: true } : i,
@@ -101,7 +101,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
     expect(after?.items[0].checked).toBe(true)
 
     // Step 3: simulate onError rollback
-    await act(async () => {
+    act(() => {
       if (previous) {
         queryClient.setQueryData(['list', LIST_ID], previous)
       }
@@ -112,7 +112,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
     expect(rolledBack?.items[0].checked).toBe(false)
   })
 
-  it('adding an item shows it in the list immediately (optimistic insert)', async () => {
+  it('adding an item shows it in the list immediately (optimistic insert)', () => {
     queryClient.setQueryData<ListItemsResponse>(['list', LIST_ID], makeItemsResponse([]))
 
     const optimisticItem: ListItem = {
@@ -123,7 +123,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
       rank: 'a0',
     }
 
-    await act(async () => {
+    act(() => {
       queryClient.setQueryData<ListItemsResponse>(['list', LIST_ID], (old) => ({
         items: [...(old?.items ?? []), optimisticItem],
       }))
@@ -136,7 +136,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
     expect(data?.items[0].id).toBeLessThan(0)
   })
 
-  it('removes the optimistically-added item if the server POST returns an error', async () => {
+  it('removes the optimistically-added item if the server POST returns an error', () => {
     const existingItem = makeItem({ id: 1 })
     queryClient.setQueryData<ListItemsResponse>(
       ['list', LIST_ID],
@@ -155,7 +155,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
       rank: 'a1',
     }
 
-    await act(async () => {
+    act(() => {
       queryClient.setQueryData<ListItemsResponse>(['list', LIST_ID], (old) => ({
         items: [...(old?.items ?? []), optimisticItem],
       }))
@@ -166,7 +166,7 @@ describe('ListDetail — D-07 optimistic update + rollback', () => {
     ).toHaveLength(2)
 
     // Simulate rollback on error
-    await act(async () => {
+    act(() => {
       if (previous) queryClient.setQueryData(['list', LIST_ID], previous)
     })