Update service worker cache revision, enhance AppSwitcher with online status indicator, and improve HTTPS setup script for PWA support

- Updated the cache revision for index.html in the service worker to ensure proper asset management.
- Enhanced AppSwitcher.vue with a new online status button for mobile/tablet views and a dropdown for desktop.
- Improved setup-https-dev.sh to include PWA snippet for nginx configuration, facilitating Android install and ensuring HTTPS is properly set up for PWA functionality.

scripts/nginx-pwa-snippet.conf

@@ -0,0 +1,17 @@
+# PWA installability - required for Add to Home Screen on Android
+# Include this inside the HTTPS server block for archipelago
+# Manifest must have Content-Type: application/manifest+json
+location = /manifest.webmanifest {
+    add_header Content-Type application/manifest+json;
+    add_header Cache-Control "public, max-age=0, must-revalidate";
+}
+# Service worker - no cache so updates apply
+location ~ ^/(sw\.js|workbox-.*\.js|registerSW\.js)$ {
+    add_header Content-Type application/javascript;
+    add_header Service-Worker-Allowed /;
+    add_header Cache-Control "no-cache, no-store, must-revalidate";
+}
+# index.html - avoid aggressive cache for PWA updates
+location = /index.html {
+    add_header Cache-Control "public, max-age=0, must-revalidate";
+}