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/api/tests/broker/poller.test.ts

@@ -32,7 +32,7 @@ const mockCredentialsSelectResult: Array<{
 
 // Each call to db.select() needs to return different chains
 // We use a call counter to decide which data to return
-let selectCallCount = 0
+let _callCount = 0
 
 const mockSelectLimit = vi.fn()
 const mockSelectWhere = vi.fn().mockReturnValue({ limit: mockSelectLimit })
@@ -44,7 +44,7 @@ mockSelectFrom.mockImplementation(() => ({
   where: mockSelectWhere,
   // Support both: direct await (no where) and .where().limit()
   then: (resolve: (v: typeof mockCredentialsSelectResult) => void) => {
-    selectCallCount++
+    _callCount++
     resolve(mockCredentialsSelectResult)
     return Promise.resolve(mockCredentialsSelectResult)
   },
@@ -71,7 +71,7 @@ vi.mock('../../src/broker/client.js', () => ({
 describe('broker poller — runPoll', () => {
   beforeEach(() => {
     vi.clearAllMocks()
-    selectCallCount = 0
+    _callCount = 0
 
     // Reset implementations
     mockSyncCalendar.mockResolvedValue(undefined)