Dashboard: greeting shows hardcoded name "Petr" instead of actual user

[yustme]

Bug

The dashboard heading greets every user with "Good Morning, Petr" regardless of who is actually logged in.

Root cause

web/frontend/src/pages/Dashboard.tsx line 96 has the name hardcoded:

title={`${greeting()}, Petr`}

Fix

The backend already has a KeboolaUser model with a name field (src/keboola_agent_cli/models.py). The fix is to:

1. Expose a /me (or /user) endpoint in the FastAPI server that returns the current user's name from the active project's token verify response.
2. Fetch it in the Dashboard and substitute Petr with the real display name.
3. Fall back gracefully to a generic greeting ("Good Morning!") if the name is unavailable.

[padak]

Shipped in v0.40.3 (PR #299).

Thank you @yustme for the detailed report — your UAT round on kbagent serve --ui drove the entire release, and your follow-up screenshots / regression notes made each round of fixes possible. 🙏