Fix caching issues - always fetch fresh content from server

Service Worker changes:
- Bump version to v1.0.1 to invalidate old caches
- Use network-first strategy for all API calls
- Use network-first strategy for HTML files
- Only use cache-first for static assets (CSS, JS libs, images)

Server changes:
- Serve service-worker.js with no-cache headers
- Serve HTML files with no-cache headers

Client changes:
- Detect service worker updates and auto-reload page
- Check for updates on every page load

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

index.html

@@ -9850,6 +9850,23 @@
                     .then(registration => {
                         console.log('Service Worker registered:', registration.scope);
 
+                        // Check for updates on every page load
+                        registration.update();
+
+                        // Handle service worker updates
+                        registration.addEventListener('updatefound', () => {
+                            const newWorker = registration.installing;
+                            console.log('New service worker installing...');
+
+                            newWorker.addEventListener('statechange', () => {
+                                if (newWorker.state === 'installed' && navigator.serviceWorker.controller) {
+                                    // New version available - skip waiting and reload
+                                    console.log('New version available, activating...');
+                                    newWorker.postMessage({ type: 'SKIP_WAITING' });
+                                }
+                            });
+                        });
+
                         // Check for updates periodically
                         setInterval(() => {
                             registration.update();
@@ -9860,6 +9877,12 @@
                     });
             });
 
+            // Reload page when new service worker takes control
+            navigator.serviceWorker.addEventListener('controllerchange', () => {
+                console.log('New service worker activated, reloading...');
+                window.location.reload();
+            });
+
             // Listen for app install prompt
             let deferredPrompt;
             window.addEventListener('beforeinstallprompt', (e) => {

server.js

@@ -64,6 +64,20 @@ app.use('/api', (req, res, next) => {
     next();
 });
 
+// Serve service-worker.js with no-cache (critical for updates)
+app.get('/service-worker.js', (req, res) => {
+    res.set('Cache-Control', 'no-store, no-cache, must-revalidate');
+    res.set('Pragma', 'no-cache');
+    res.sendFile(path.join(__dirname, 'service-worker.js'));
+});
+
+// Serve HTML files with no-cache to ensure fresh content
+app.get(['/', '/index.html', '/admin.html'], (req, res, next) => {
+    res.set('Cache-Control', 'no-store, no-cache, must-revalidate');
+    res.set('Pragma', 'no-cache');
+    next();
+});
+
 // Serve static files - prioritize data directory for default.kml
 app.get('/default.kml', async (req, res) => {
     try {

service-worker.js

@@ -1,5 +1,6 @@
 // HikeMap Service Worker
-const CACHE_NAME = 'hikemap-v1.0.0';
+// Increment version to force cache refresh
+const CACHE_NAME = 'hikemap-v1.0.1';
 const urlsToCache = [
   '/',
   '/index.html',
@@ -78,13 +79,51 @@ self.addEventListener('fetch', event => {
     return;
   }
 
-  // Handle API calls with network-first strategy
+  // Handle ALL API calls with network-first strategy
+  if (url.pathname.startsWith('/api/')) {
+    event.respondWith(
+      fetch(event.request)
+        .then(response => {
+          return response;
+        })
+        .catch(() => {
+          // Fall back to cache for API calls if offline
+          return caches.match(event.request);
+        })
+    );
+    return;
+  }
+
+  // Handle HTML files with network-first strategy (always get fresh version)
+  if (event.request.destination === 'document' ||
+      url.pathname === '/' ||
+      url.pathname.endsWith('.html')) {
+    event.respondWith(
+      fetch(event.request)
+        .then(response => {
+          // Cache the fresh version
+          if (response.status === 200) {
+            const responseToCache = response.clone();
+            caches.open(CACHE_NAME).then(cache => {
+              cache.put(event.request, responseToCache);
+            });
+          }
+          return response;
+        })
+        .catch(() => {
+          // Fall back to cache only if network fails
+          return caches.match(event.request);
+        })
+    );
+    return;
+  }
+
+  // Handle geocache/KML data with network-first
   if (url.pathname.includes('/save-kml') ||
       url.pathname.includes('/geocaches')) {
     event.respondWith(
       fetch(event.request)
         .then(response => {
-          // Cache successful API responses
           if (response.status === 200) {
             const responseToCache = response.clone();
             caches.open(GEOCACHE_CACHE).then(cache => {
@@ -94,14 +133,13 @@ self.addEventListener('fetch', event => {
           return response;
         })
         .catch(() => {
-          // Fall back to cache for API calls
           return caches.match(event.request);
         })
     );
     return;
   }
 
-  // Default strategy: cache-first for assets
+  // Default strategy: cache-first for static assets (CSS, JS libraries, images)
   event.respondWith(
     caches.match(event.request)
       .then(response => {