Remove divider line between left and right panels #143
Description
Description
The vertical divider line between the left navigation panel and the right aside panel doesn't look great visually. Remove it for a cleaner appearance.
Context
The Mantine AppShell aside component currently renders with withBorder. This border should be removed or replaced with a subtler visual separation (e.g., background color difference or shadow).
Acceptance Criteria
- The hard divider line between the left and right panels is removed
- The layout still feels visually organized without the divider
- No regression in the panel layout or spacing