feat: hyperlinks, group seen-by for all, profile-pic preview, in-call invite fix + desktop update progress (0.1.6)

- #1: URLs in chat are now clickable links (open externally on desktop).
- #2: group 'Seen by X, Y +N more' now shows under the LATEST message to EVERYONE
  (server computes reads for all messages; click shows the names).
- #5: tapping the conversation-header avatar previews the DP/group photo full-size.
- #4: in-call invite lists only people you've messaged, excludes those already in the
  call/invited, and the Invite button is sticky.
- #3 (0.1.6 shell): auto-updater emits checking/available/downloading/ready/error to
  the web UI, which shows a progress banner (+ Restart button) so updates aren't silent.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

desktop/main.js

@@ -46,6 +46,8 @@ ipcMain.handle('check-updates', async () => {
     return (v && v !== current) ? { status: 'available', version: v, current } : { status: 'current', current };
   } catch (e) { return { status: 'error', message: String((e && e.message) || e), current }; }
 });
+// #3: restart-and-install, triggered from the web update banner's "Restart" button.
+ipcMain.handle('restart-to-update', () => { try { if (autoUpdater) autoUpdater.quitAndInstall(); } catch (_) {} });
 // Chat toast: sender/group avatar + message; clicking it raises the app and opens that chat.
 // Uses Electron's OWN Notification (native, no SnoreToast) whose 'click' event fires reliably.
 const APP_ID = 'com.bizgaze.connect.desktop';
@@ -236,10 +238,19 @@ app.whenReady().then(() => {
   app.on('activate', () => { if (BrowserWindow.getAllWindows().length === 0) createWindow(); });
   // Check for shell updates on launch, then every 6 hours. Only in packaged builds.
   if (app.isPackaged && autoUpdater) {
+    // #3: surface update progress to the web UI so the user can SEE an update is downloading /
+    // installing, instead of it happening silently in the background.
+    const sendUpdate = (data) => { try { if (win && !win.isDestroyed()) win.webContents.send('update-event', data); } catch (_) {} };
+    autoUpdater.on('checking-for-update', () => sendUpdate({ phase: 'checking' }));
+    autoUpdater.on('update-available', (info) => sendUpdate({ phase: 'available', version: info && info.version }));
+    autoUpdater.on('update-not-available', () => sendUpdate({ phase: 'current' }));
+    autoUpdater.on('download-progress', (p) => sendUpdate({ phase: 'downloading', percent: Math.round((p && p.percent) || 0) }));
+    autoUpdater.on('error', () => sendUpdate({ phase: 'error' }));
     // When an update finishes downloading (auto or via the Settings "Check for updates"), offer a
     // clear restart prompt instead of only the silent on-next-launch install.
     let promptedForUpdate = false;
     autoUpdater.on('update-downloaded', async (info) => {
+      sendUpdate({ phase: 'ready', version: info && info.version });
       if (promptedForUpdate) return; promptedForUpdate = true;
       try {
         const { dialog } = require('electron');