Fix empty sidebar scroll

[alwaysmavs]

Summary

Fix the sidebar showing a vertical scrollbar when the task list is empty.

Problem

With no tasks, the sidebar still displayed a scrollbar even though the empty state visually fit within the available area. This made the empty task panel look slightly overflowed and suggested that hidden content was present.

Root cause

The task section heading was rendered before an empty-state component whose minimum height was set to the full height of the scroll container. The heading height and margin were therefore added on top of a full-height empty state, making the total content slightly taller than the container and triggering vertical overflow.

Fix

The sidebar session scroll container now uses a vertical flex layout. The task and project empty states use min-h-0 with flex-1, so they occupy only the remaining height after section controls and headings. The scroll container keeps overflow-y-auto, preserving normal scrolling when task or project content genuinely exceeds the available space.

Validation

• corepack pnpm run lint
• corepack pnpm run ts-check
• Oxfmt check for the modified files
• git diff --check
• Electron development startup

[coderabbitai]

Walkthrough

The sidebar layout styling is updated in three container declarations. The session-scroll container now explicitly uses flex layout, while the SidebarEmptyState and ProjectSidebarEmptyState containers use min-h-0 instead of min-h-full. No component logic, props, or rendering structure changes.

🚥 Pre-merge checks | ✅ 3 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Title check	⚠️ Warning	The title is clear but does not follow the required type(scope): subject format.	Rename it to match the required format, for example fix(sidebar): remove empty-state scrollbar.

✅ Passed checks (3 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	It covers Summary, Problem, Root cause, Fix, and Validation, but omits the template's Safety and Compatibility checklist.

✨ Finishing Touches

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch codex/fix-empty-sidebar-scroll

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