Allow customization of the Workflow Studio top bar

## Feature Request

### Problem Overview
The Workflow Studio top bar is currently static and cannot be customized.
In many cases, it would be useful to display user-specific or contextual information, such as:

Logged-in user name, role, or tenant
Company branding (logo, version info)
Custom quick-access actions (links, buttons)

Right now, there is no way to extend this area, which limits personalization and usability in enterprise deployments.

### Proposed Solution
Introduce a mechanism to customize the Workflow Studio top bar, allowing developers to inject additional UI elements.

### Alternative Solutions
Another option is modifying the source code directly, but this is not sustainable for long-term upgrades.

### Use Cases
Show logged-in user info (name, role, tenant) in the top bar.
Add a logout button directly in the bar.
Add environment information (e.g., "DEV / TEST / PROD").
Integrate quick links to documentation or support.