[BUG] Background tasks option missing from session menu when no tasks are running

Description

The "Background tasks" option in the three-dot session context menu is no longer visible when there are no active background tasks. Previously, the option was always present and allowed opening the (empty) Background tasks panel at any time. Now, the menu entry only appears conditionally when at least one background task is actually running.

Steps to reproduce

1. Open Claude Code desktop (Windows).
2. Open the three-dot context menu on any session that has no running background tasks.
3. Observe that "Background tasks" is not listed in the menu.
4. Start a background task in that session.
5. Open the same menu again — "Background tasks" now appears with a checkmark.

Expected behavior

The "Background tasks" menu option should always be available (as it was a few days ago), allowing the user to open the panel even when empty.

Actual behavior

"Background tasks" disappears from the context menu entirely when no tasks are running. The panel is inaccessible unless tasks are already active.

Environment

• Platform: Windows 10 Pro 10.0.19045
• Claude Code: desktop app

Additional context

This appears to be a recent regression (changed within the last few days).