Ticket #88 Review (Phase 8 - Personalization): PASS. PR #39 added 15 files (+1263/-0). Comprehensive personalization: dark mode (theme_controller.js with light/dark/system, CSS custom properties), density (comfortable/compact classes), notifications (toggle switches), dashboard layout (drag-drop reordering, section show/hide), saved views (CRUD with filters), keyboard shortcuts (global key sequences, customizable), column visibility (show/hide with localStorage). 10 new Stimulus controllers: theme, density, toggle, keyboard_shortcuts, shortcuts_modal, dashboard_layout, saved_views, saved_view_form, saved_view_modal, column_visibility. 2 new Rails controllers: PreferencesController, SavedViewsController. Uses NullUser placeholder pattern for future authentication.