Project list renders blank space at top, items disappear on scroll (scheduled tasks)

Bug Description

The scheduled tasks list in Claude Code Desktop (Code tab) renders a large blank space at the top of the list. When scrolling, some task cards disappear and the list is not fully visible.

Steps to Reproduce

1. Have 15+ scheduled tasks (mix of local and remote)
2. Open the Code tab → "Tous les projets" (All projects) view
3. Scroll through the task list

Observed Behavior

• Large blank/white area at the top of the list before the first task card
• When scrolling, some task cards disappear entirely — only 2 of 15+ tasks visible at times
• Reducing the number of active tasks (from 13 to 7) shrinks the blank area but does not eliminate it
• Resizing the window does not fix it
• Hard refresh / app restart does not fix it

Environment

• Claude Code Desktop (macOS)
• macOS 26 (Darwin 25.3.0)
• MacBook Pro 16" 2019, Intel Core i9
• Mix of local + remote ("Rive") scheduled tasks

Likely Cause

Virtualized list component miscalculating row heights or total container height when rendering scheduled task cards. The correlation between task count and blank space size supports this.