feat: added user avatar

[vinit-truefoundry]

---

Note

Low Risk
Mostly UI and public slot API; session probing now maps auth.me() display name into React state with no change to auth redirects or authorization.

Overview
Adds a host-overridable UserAvatar slot that shows initials and a truncated display name in shell chrome across sidebar, drawer, dock, and widget layouts. Hosts pass identity via a new currentUser prop on TrueForgeUI, backed by CurrentUserProvider and useOptionalCurrentUser.

The default UserAvatar atom reads from that context, renders nothing without a non-empty name, and supports a labeled variant for the sidebar rail. Custom chrome can replace it with overrides.UserAvatar.

The TrueForge frontend now treats session state as structured objects (including displayName from /me) instead of plain 'authenticated' | 'unauthenticated', and passes currentUser={{ displayName: session.displayName }} into the UI after login.

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[changeset-bot]

🦋 Changeset detected

Latest commit: 749c3db

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