chore(web): kanban dashboard redesign — Linear-inspired design system
Redesign the kanban dashboard with a Linear-inspired aesthetic:
- New design tokens (neutral charcoal darks, white-alpha borders, muted status colors, indigo accent)
- Tighter spacing, visible column backgrounds, dark mode weight reduction
- Redesigned SessionCard, ProjectSidebar, and AttentionZone components
- Removed list view toggle, reordered columns (respond → merge → done)
- Added ThemeToggle, Skeleton/EmptyState components, and showcase page
- Exported CI_STATUS and getSizeLabel for component consumption
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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