feat: move desktop runtime diagnostics out of the primary UI

[ibourgeois]

Context

As an end user, I need the Katra desktop shell to focus on the product experience rather than developer diagnostics, so the app feels intentional and approachable on first open.

Acceptance Criteria

• Runtime and database connection details are removed from the main user-facing shell.
• The primary app surface no longer depends on visible developer diagnostics to explain the product.
• Equivalent diagnostic information remains available through developer-oriented logs or a non-primary debug surface.
• Electron or application logs capture the runtime/connection details needed for debugging local issues.
• This issue is coordinated with the MVP shell work so the user-facing landing experience stays clean.

Notes

This issue does not remove diagnostics entirely. It relocates them to a more appropriate developer-focused surface so the app can present a better first impression without making debugging harder.

Out of Scope

• a full developer tools panel implementation unless needed for parity with the existing visible diagnostics