Implemented the all_projects mode in the kanban action: - Added `@all_projects_mode` flag that checks for `all_projects=true` parameter - When true, fetches tickets from all active projects using `Project.active.all` - Includes project association with tickets to avoid N+1 queries - Sets `@project` to nil in all-projects mode - Preserves existing single-project functionality The implementation: 1. Checks params[:all_projects] and converts to boolean 2. In all-projects mode: fetches from all active projects, excludes archived projects 3. In single-project mode: works as before with project_id parameter 4. Eager loads project, assigned_agent, and subtasks associations for efficiency