Color Kanban columns by status

[eysenfalk]

Summary

• derive Kanban column colors from configured TaskNotes status colors
• tint flat columns and swimlane header/cell grids with the same status color
• preserve normal rendering for non-status grouping, unknown statuses, statuses without colors, and invalid CSS colors
• keep the tint subtle and theme-aware in light and dark mode

Implementation

The renderer resolves the configured status, normalizes TaskNotes theme colors, validates the resulting CSS color in the owning document, and exposes it through a Kanban-scoped CSS custom property. CSS applies the tint only when the status-colored marker is present.

Validation

• npx jest tests/unit/bases/KanbanView.statusColors.test.ts --runInBand
• npm test
• npm run typecheck
• npm run lint
• npm run build:test
• isolated Obsidian runtime reload with no plugin errors
• flat Kanban and swimlanes checked in light mode; swimlanes also checked in dark mode
• independent bounded review: approved with no fix-created regressions

Runtime preview

Runtime screenshots cover flat columns in light mode and swimlanes in both light and dark mode. They remain validation artifacts and are not committed to the plugin repository.

Scope

This PR contains only status-derived Kanban colors. It does not include column collapse or drag-animation changes.