- Add `color` (text) and `archivedAt` (timestamp) columns to projects table
- Add PROJECT_COLORS palette constant (10 colors) in shared package
- Add color/archivedAt to Project type interface and Zod validators
- Auto-assign next available color from palette on project creation
- New SidebarProjects component with:
- Collapsible PROJECTS header above WORK section
- Caret toggle visible on hover (left of header)
- Always-visible plus button (right of header) opens NewProjectDialog
- Lists non-archived projects with colored rounded squares
- Active project highlighted based on URL match
- Remove Projects nav item from WORK section in sidebar
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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