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/components/CalendarShell.tsx

@@ -156,7 +156,7 @@ export function CalendarShell() {
   // IANATimezone (the config's timezone type) is declared but not exported by @schedule-x/calendar,
   // so derive it from useCalendarApp's config parameter rather than importing it.
   type SxTimeZone = NonNullable<Parameters<typeof useCalendarApp>[0]['timezone']>
-  const displayTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone as SxTimeZone
+  const displayTimeZone: SxTimeZone = Intl.DateTimeFormat().resolvedOptions().timeZone
 
   // useCalendarApp — config is stable; plugins passed as second argument
   const calendar = useCalendarApp(
@@ -169,7 +169,7 @@ export function CalendarShell() {
       ],
       defaultView,
       timezone: displayTimeZone,
-      firstDayOfWeek: SX_FIRST_DAY_OF_WEEK as 7,
+      firstDayOfWeek: SX_FIRST_DAY_OF_WEEK,
       calendars: calendarsConfig,
       callbacks: {
         onRangeUpdate(range) {
@@ -197,7 +197,7 @@ export function CalendarShell() {
   useEffect(() => {
     if (!eventsQuery.data) return
     const sxEvents = hydrateEvents(eventsQuery.data.occurrences)
-    eventsService.set(sxEvents as Parameters<typeof eventsService.set>[0])
+    eventsService.set(sxEvents)
   }, [eventsQuery.data, eventsService])
 
   // Auth redirect — one-shot full-page nav to /api/login when /api/me fails.
@@ -351,7 +351,7 @@ export function CalendarShell() {
                   color: 'var(--color-text-primary)',
                 }}
               >
-                Couldn't load events
+                Couldn&apos;t load events
               </h2>
               <p
                 style={{
@@ -363,7 +363,7 @@ export function CalendarShell() {
                 Check your connection and try again.
               </p>
               <button
-                onClick={() => queryClient.refetchQueries({ queryKey: ['events'] })}
+                onClick={() => { void queryClient.refetchQueries({ queryKey: ['events'] }) }}
                 style={{
                   background: 'var(--color-surface-dim)',
                   border: '1px solid var(--color-border)',