chore: force cache refresh for map header changes

- Bump Service Worker VERSION to 1754659000
- Update cache-busting timestamps in map.html
- Ensures new forest header image and UI adjustments are served
- Reduces chance of stale content from SW cache on hf.space

static/map.html

@@ -813,7 +813,7 @@
         // Force refresh if we detect cached version
         (function() {
             const currentVersion = '5.1.0';
-            const timestamp = '1754657640'; // Current timestamp for cache busting
+const timestamp = '1754659000'; // Current timestamp for cache busting
             const lastVersion = sessionStorage.getItem('treetrack_version');
             const lastTimestamp = sessionStorage.getItem('treetrack_timestamp');
             
@@ -941,7 +941,7 @@
 
     <!-- Leaflet JS -->
     <script src="https://unpkg.com/[email protected]/dist/leaflet.js"></script>
-    <script src="/static/map.js?v=4.0.1&t=1754657800"></script>
+<script src="/static/map.js?v=4.0.1&t=1754659000">
     
     <script>
         // Initialize Granim background animation on page load

static/sw.js

@@ -1,5 +1,5 @@
 // TreeTrack Service Worker - PWA and Offline Support
-const VERSION = 1754657700; // Cache busting - updated for popup close button fix, Granim improvements, and full viewport coverage
+const VERSION = 1754659000; // Cache busting bump - force clients to fetch new static assets and header image change
 const CACHE_NAME = `treetrack-v${VERSION}`;
 const STATIC_CACHE = `static-v${VERSION}`;
 const API_CACHE = `api-v${VERSION}`;