Good. Now I have a full understanding of the existing project. Let me read a few more files and then write the plan.

Now I have a complete picture. Let me write the implementation plan.

Great, I have both the plan and original requirements. Let me set up tasks and start building.

Now let me generate a design brief and read existing files I'll need to modify, all in parallel.

Now I have everything I need. Let me start building. First, the foundation layer -- types, storage, seed data, i18n, and auth.

Now the i18n system and auth context:

Now the i18n context and auth context:

Foundation layer is complete. Moving to task 2: Layout, Sidebar, and Login.

Let me read the existing theme provider and sidebar component to use them properly:

Good, I can see the sidebar exports. Now let me update the globals.css for the new theme, update the root layout, create the app sidebar, and the login page -- all in parallel since they're independent files:

Now the sidebar, theme toggle, language switcher, login page, and root redirect:

Now the login page, app layout, and root page redirect:

Good. Now let me move to the Dashboard task.

Now moving to the Employees module.

Now moving to the Trainings module.

Now the final task -- Validity and Alerts modules.

Now let me mark all tasks as done and verify the app loads correctly.

Let me quickly verify a couple of things to make sure there are no import issues -- I need to check if the sonner component exists in the project:

Both components exist. Let me also check if the tailwind.config.ts needs the font family update for the Inter/Noto Sans JP fonts:

I need to add the font family configuration to the tailwind config:

The core training management system is now complete. Here's a summary of everything built:

Foundation: TypeScript types for all entities, localStorage-based CRUD storage with audit logging, seed data (8 sample employees, varied training records), i18n system with Japanese/English/Portuguese translations, and role-based auth context (admin/supervisor/viewer).

Layout & Navigation: Dark-themed sidebar with collapsible icon mode, theme toggle (dark/light), language switcher, user dropdown with logout, and route protection that redirects unauthenticated users to login.

Core Modules: Dashboard with stat cards and Recharts bar chart showing training completion by chapter/branch; Employees with data table, search/filter, add/edit/deactivate/delete, and CSV import with preview; Trainings with registration form for chapters I-V or free-text extra trainings, plus filterable history table; Validity showing a matrix of each employee's chapter status (Valid/Expiring/Expired/Not Done) with tooltips; and Alerts listing employees with expired or expiring-soon trainings sorted by severity.

Log in with admin / admin to explore the full system. Phase 2 (Accidents, KYT AI, PDF Reports) is ready to be added when you'd like.