1.1.10

- Unified Steam, Google, Apple, and email sign-in across web, iOS, Android,
macOS, Windows, and Linux, including browser-based Apple authentication for
Developer ID builds distributed through Steam and itch.io.

- Separated Mac App Store and Developer ID signing entitlements so native Apple
sign-in remains available in store builds while notarized Steam and itch.io
packages use the supported browser flow.

- Added server-managed Apple and Google browser callbacks with expiring state,
PKCE verification, polling, rate limits, and cleanup of expired requests.

- Repaired Steam OpenID response verification, bounded provider traffic, and
added actionable server diagnostics for rejected signatures and HTTP errors.

- Fixed Flutter WASM startup on the demo site by passing the multiplayer
protocol version explicitly instead of invoking an incompatible tear-off.

- Expanded social-auth integration coverage and kept release architecture and
coverage baselines aligned with the cross-platform authentication flow.