Support for Multiple Logged-In Accounts

[BialySztorm]

Description
Currently it allows logging in with only one Steam account at a time. It would be very useful to support multiple simultaneous account logins — for example, being able to stay logged into several Steam accounts at once and easily switch between them without logging out each time.

Why this would be useful

• Many users manage multiple Steam accounts (e.g., family members, secondary libraries, or testing environments).
• Switching between accounts currently requires full logout/login cycles, which is time-consuming and breaks the workflow.
• In the future, when other platforms (like GOG, Epic Games, or others) are supported, having a unified multi-account system would allow seamless access to all owned libraries across platforms.

Suggested Implementation

• Add a “Manage Accounts” section where users can log into multiple accounts and toggle between them.
• Optionally display all games from all linked accounts together or allow filtering by account/platform.
• Extend the same functionality to future integrations (e.g., GOG, Epic, Ubisoft Connect, etc.).

Example use case

I have two Steam accounts — one for my main library and another for family sharing. I’d like to have both connected so I can quickly launch games from either without signing in and out repeatedly.