feat: Add A-Z filter for clients/suppliers in Telegram bot

- Add A-Z alphabetical filter keyboard for clients and suppliers lists
  (same pattern as company selection, without emoji)
- Increase clients/suppliers list pagination from 10 to 20 items per page
- Remove emoji from company A-Z filter button for consistency
- Add 6 new callback handlers: clients_alpha_menu, clients_alpha:LETTER,
  clients_alpha_page:PAGE:LETTER, and supplier equivalents
- Dashboard service and models updates
- Telegram bot: email handlers, auth, DB operations, internal API improvements
- Frontend: dashboard cards updates (CashFlow, Clienti, Furnizori, Treasury)
- Frontend: SolduriCompactCard and CollapsibleCard improvements
- DashboardView enhancements
- start.sh and run-with-restart.sh script updates
- IIS web.config and service worker updates

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/sw.js

@@ -28,10 +28,24 @@ self.addEventListener('activate', (event) => {
       }),
       // Take control of all clients immediately
       clients.claim()
-    ])
+    ]).then(() => {
+      // Notify all clients that a new SW version is active
+      return clients.matchAll({ includeUncontrolled: true }).then(allClients => {
+        allClients.forEach(client => {
+          client.postMessage({ type: 'SW_UPDATED' });
+        });
+      });
+    })
   );
 });
 
+// Message handler - allows pages to trigger SW actions
+self.addEventListener('message', (event) => {
+  if (event.data && event.data.type === 'SKIP_WAITING') {
+    self.skipWaiting();
+  }
+});
+
 // Fetch event - ALWAYS network first, no caching for HTML/JS/CSS
 self.addEventListener('fetch', (event) => {
   const url = new URL(event.request.url);
@@ -47,6 +61,19 @@ self.addEventListener('fetch', (event) => {
     return;
   }
 
+  // index.html - bypass HTTP cache entirely to always get fresh app shell
+  if (
+    url.pathname.endsWith('index.html') ||
+    url.pathname === '/roa2web/' ||
+    url.pathname === '/roa2web'
+  ) {
+    event.respondWith(
+      fetch(event.request, { cache: 'no-cache' })
+        .catch(() => caches.match(event.request))
+    );
+    return;
+  }
+
   // HTML, JS, CSS - always fetch fresh from network
   // This ensures PWA always loads latest version
   event.respondWith(