Use AI to Set macOS app name to 64Gram and Bundle ID to io.github.tdesktop_x64.TDesktop

[fmz200]

Summary

Rename the macOS build output from Telegram/Telegram Lite to 64Gram and unify the Bundle ID to io.github.tdesktop_x64.TDesktop across all macOS configurations.

Changes

• CMakeLists.txt: Restructured the macOS output configuration with if (APPLE) / else() guard. Non-Apple platforms get empty defaults for bundle_identifier/bundle_entitlements to avoid undefined variable expansion on Windows/Linux builds.
• Telegram.plist: CFBundleGetInfoString updated to "64Gram Desktop messaging app"
• updater_osx.m, update_checker.cpp, specific_mac_p.mm: Updated .app name and data path references
• build.sh, updates.py: Updated macOS binary name references
• mac.yml, mac_packaged.yml: Updated CI artifact paths, added DMG creation step

Impact

Non-Apple platforms (Windows, Linux) are unaffected. macOS build verified via GitHub Actions, DMG artifact produced successfully.