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/hooks/useListSSE.test.ts

@@ -53,7 +53,7 @@ class MockEventSource {
   constructor(url: string, init?: { withCredentials?: boolean }) {
     this.url = url
     this.withCredentials = init?.withCredentials ?? false
-    mockInstances.push(this as unknown as MockEventSourceInstance)
+    mockInstances.push(this)
   }
 
   addEventListener(type: string, handler: (ev: MessageEvent) => void) {

apps/pwa/src/hooks/useListSSE.ts

@@ -55,7 +55,8 @@ export function useListSSE({ listId, onStateChange }: UseListSSEOptions): void {
 
   // handleListChange is stable — invalidate the list on any list-change event
   const handleListChange = useCallback(() => {
-    queryClient.invalidateQueries({ queryKey: ['list', listId] })
+    // fire-and-forget: cache invalidation; React Query handles the refetch lifecycle
+    void queryClient.invalidateQueries({ queryKey: ['list', listId] })
   }, [queryClient, listId])
 
   const connect = useCallback(() => {
@@ -76,8 +77,8 @@ export function useListSSE({ listId, onStateChange }: UseListSSEOptions): void {
       // Reset attempt counter on successful open (D-11)
       attemptsRef.current = 0
       onStateChange('connected')
-      // Full refetch on (re)connect — D-10: no Last-Event-ID replay, just refetch
-      queryClient.invalidateQueries({ queryKey: ['list', listId] })
+      // Full refetch on (re)connect — D-10: no Last-Event-ID replay, just refetch; fire-and-forget
+      void queryClient.invalidateQueries({ queryKey: ['list', listId] })
     }
 
     es.onerror = () => {