feat(phase1): rebrand to TTRPG Player and drop Git updates feed

Rename product to TTRPG Player (TTRPGPlayer / com.ttrpgplayer.app), use .ttrpg.zip for new saves while keeping .dnd.zip import, accept TTRPG- and DND- license keys on client, and remove sync-update-feed plus CI push to DndGamePlayerUpdates.

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

app/main/windows/bootWindow.ts

@@ -2,6 +2,7 @@ import path from 'node:path';
 
 import { app, BrowserWindow } from 'electron';
 
+import { appDisplayNameForLocale } from '../../shared/appBranding';
 import { getAppSemanticVersion } from '../versionInfo';
 
 import { loadBrandingWindowIcon } from './brandingIcon';
@@ -93,7 +94,7 @@ export function setBootWindowStatus(win: BrowserWindow, text: string): void {
 
 export function applyBootWindowBranding(win: BrowserWindow): void {
   if (win.isDestroyed()) return;
-  const name = app.getName();
+  const name = appDisplayNameForLocale(app.getLocale());
   const version = getAppSemanticVersion();
   const versionLabel = version.trim().length > 0 ? `v${version.trim()}` : '';
   void win.webContents.executeJavaScript(