Fix service worker install failure due to missing icon files

The service worker was failing to install because it tried to cache
icon files that don't exist (icon-192.png, icon-512.png).

Simplified the service worker to focus only on push notifications:
- Removed caching during install (was causing "redundant" state)
- Removed fetch handler caching
- Removed references to non-existent icon files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

public/sw.js

@@ -1,66 +1,16 @@
 // NextStep Service Worker for Push Notifications
 
-const CACHE_NAME = 'nextstep-v1'
+// Install event - activate immediately
-
-// Install event - cache critical assets
 self.addEventListener('install', (event) => {
   console.log('Service Worker: Installing...')
-  event.waitUntil(
+  // Skip waiting to activate immediately
-    caches.open(CACHE_NAME).then((cache) => {
-      return cache.addAll([
-        '/',
-        '/today',
-        '/meds',
-        '/icon-192.png',
-        '/icon-512.png',
-      ])
-    })
-  )
   self.skipWaiting()
 })
 
-// Activate event - clean up old caches
+// Activate event - claim clients immediately
 self.addEventListener('activate', (event) => {
   console.log('Service Worker: Activating...')
-  event.waitUntil(
+  event.waitUntil(self.clients.claim())
-    caches.keys().then((cacheNames) => {
-      return Promise.all(
-        cacheNames
-          .filter((name) => name !== CACHE_NAME)
-          .map((name) => caches.delete(name))
-      )
-    })
-  )
-  self.clients.claim()
-})
-
-// Fetch event - serve from cache when offline
-self.addEventListener('fetch', (event) => {
-  // Only cache GET requests
-  if (event.request.method !== 'GET') return
-
-  event.respondWith(
-    caches.match(event.request).then((cached) => {
-      // Return cached version or fetch from network
-      return (
-        cached ||
-        fetch(event.request).then((response) => {
-          // Don't cache API responses
-          if (event.request.url.includes('/api/')) {
-            return response
-          }
-          // Cache successful responses
-          if (response.status === 200) {
-            const clone = response.clone()
-            caches.open(CACHE_NAME).then((cache) => {
-              cache.put(event.request, clone)
-            })
-          }
-          return response
-        })
-      )
-    })
-  )
 })
 
 // Push event - handle incoming push notifications
@@ -70,8 +20,6 @@ self.addEventListener('push', (event) => {
   let data = {
     title: 'Medication Reminder',
     body: 'Time to take your medication',
-    icon: '/icon-192.png',
-    badge: '/badge-72.png',
     tag: 'medication-reminder',
     data: {
       url: '/meds',
@@ -88,15 +36,9 @@ self.addEventListener('push', (event) => {
 
   const options = {
     body: data.body,
-    icon: data.icon || '/icon-192.png',
-    badge: data.badge || '/badge-72.png',
     tag: data.tag || 'default',
     vibrate: [100, 50, 100],
     data: data.data || {},
-    actions: data.actions || [
-      { action: 'take', title: 'Taken' },
-      { action: 'snooze', title: 'Snooze' },
-    ],
     requireInteraction: true,
   }