[Web] Auth WS reconnection race condition & async Promise constructor anti-pattern

[Flegma]

Summary

Auth flow has a race condition during WebSocket reconnection and uses an error-prone pattern.

Findings

• AuthStore — hardcoded 10-second timeout may fire before WebSocket connects. Subscription never stored for cleanup.
• AuthStore — new Promise(async (resolve) => {...}) anti-pattern can swallow rejections.

Impact

Auth flow can fail intermittently. Promise rejections may go unhandled.

Suggested Fix

Replace new Promise(async ...) with proper async/await. Store subscription reference. Make timeout configurable.

[Flegma]

Resolved by merged PR 5stackgg/web#264