Added project selector dropdown to the Kanban board UI: - Added a new section displaying current project selection with a dropdown button - Shows "All Projects" in indigo when in all-projects mode - Shows project name in single-project mode - Dropdown uses Stimulus controller "project-selector" for toggle functionality - Dropdown menu includes: - "All Projects" option linking to all_projects=true - List of all active projects (excludes archived) - Each link navigates directly to the filtered view (not AJAX, uses standard links) NOTES: - The Stimulus controller file (project_selector_controller.js) needs to be created manually due to file permission issues - The index.js file needs to be updated to register the new controller - Both files are available in /tmp/ for manual placement