Major PWA and mobile UI improvements

- Fixed PWA installation on Android by correcting manifest.json icon configuration
- Made UI mobile-friendly with compact layout and sticky record button
- Implemented auto-translation after transcription stops
- Updated branding from 'Voice Translator' to 'Talk2Me' throughout
- Added reverse proxy support with ProxyFix middleware
- Created diagnostic tools for PWA troubleshooting
- Added proper HTTP headers for service worker and manifest
- Improved mobile CSS with responsive design
- Fixed JavaScript bundling with webpack configuration
- Updated service worker cache versioning
- Added comprehensive PWA documentation

These changes ensure the app works properly as a PWA on Android devices
and provides a better mobile user experience.

static/pwa-update.js

@@ -0,0 +1,41 @@
+// PWA Update Helper
+// This script helps force PWA updates on clients
+
+// Force service worker update
+if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.getRegistrations().then(function(registrations) {
+        for(let registration of registrations) {
+            registration.unregister().then(function() {
+                console.log('Service worker unregistered');
+            });
+        }
+    });
+    
+    // Re-register after a short delay
+    setTimeout(function() {
+        navigator.serviceWorker.register('/service-worker.js')
+            .then(function(registration) {
+                console.log('Service worker re-registered');
+                registration.update();
+            });
+    }, 1000);
+}
+
+// Clear all caches
+if ('caches' in window) {
+    caches.keys().then(function(names) {
+        for (let name of names) {
+            caches.delete(name);
+            console.log('Cache cleared:', name);
+        }
+    });
+}
+
+// Reload manifest
+var link = document.querySelector('link[rel="manifest"]');
+if (link) {
+    link.href = link.href + '?v=' + Date.now();
+    console.log('Manifest reloaded');
+}
+
+console.log('PWA update complete. Please reload the page.');