fix(mac): updater progress UI and skip redundant download

Show update stage in the modal, forward electron-updater progress over IPC,
and install immediately when the build is already cached. Rename window titles to TTRPG - *.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/main/windows/bootWindow.ts

@@ -2,7 +2,7 @@ import path from 'node:path';
 
 import { app, BrowserWindow } from 'electron';
 
-import { appDisplayNameForLocale } from '../../shared/appBranding';
+import { appDisplayNameForLocale, windowChromeTitle } from '../../shared/appBranding';
 import { getAppSemanticVersion } from '../versionInfo';
 
 import { loadBrandingWindowIcon } from './brandingIcon';
@@ -64,6 +64,7 @@ export function createBootWindow(): BrowserWindow {
       /* ignore */
     }
   }
+  win.setTitle(windowChromeTitle('boot', app.getLocale()));
 
   bootSplashRef = win;
   win.once('closed', () => {

app/main/windows/createWindows.ts

@@ -2,6 +2,7 @@ import path from 'node:path';
 
 import { app, BrowserWindow, screen } from 'electron';
 
+import { windowChromeTitle } from '../../shared/appBranding';
 import { ipcChannels } from '../../shared/ipc/contracts';
 
 import { getBootSplashWindow } from './bootWindow';
@@ -140,6 +141,8 @@ function createWindow(kind: WindowKind, opts?: CreateWindowOpts): BrowserWindow
     }
   }
 
+  win.setTitle(windowChromeTitle(kind, app.getLocale()));
+
   win.webContents.on('preload-error', (_event, preloadPath, error) => {
     console.error(`[preload-error] ${preloadPath}:`, error);
   });