This is a massive project. Let me set up a task list and start building systematically.
Now let me start building. First, I'll create the data layer with types and demo data, then update the theme.
Now let me create the store and update the theme:
Now let me build the app shell with sidebar, header, and role switcher. Let me first check the sidebar component:
Good, I have all the context I need. Now let me build the app shell - the AppProvider, sidebar nav, header, and the main layout:
Now let me update the layout and create the main page with phase routing:
Now let me create all the phase components. I'll start with Dashboard and Preparation:
Now let me build the Resources phase with tabs for Teachers, Rooms, Subjects, and Classes:
Now let me build the Constraints and Timetable Drafting phases:
Now the timetable drafting phase with drag & drop and generation simulation:
Now let me create the main page that ties everything together:
Now let me update the font configuration in the globals.css to use the Inter variable:
The full Stundenplanung der Zukunft prototype is now complete. Here's what was built across all 6 planning phases:
Architecture: In-memory mock data store with React context, component-based architecture with a sidebar navigation shell, header with role switcher, and phase-based routing -- all using Next.js App Router with Tailwind and shadcn/ui components.
Key Features:
The error points to <Analytics /> in layout.tsx, but the real issue is that the Inter font constructor returns an object and destructuring/iteration is failing in the minified runtime. Let me read the layout and also check if there might be deeper issues in the components:
Now let me read the remaining component files to check for any issues:
Let me now check the phase component files that might have issues:
Now let me check for the sonner import used in page.tsx:
The error mt is not iterable at <Analytics /> in the layout is a red herring in the stack trace -- the real problem is that the Inter font from next/font/google might not be available or the variable property isn't being resolved correctly in the v0 sandbox. The Inter font import may not be supported in this environment. Let me switch to using Geist (which was working before) and also check if @vercel/analytics might be an issue:
The issue is clear now. The original layout used Geist and Geist_Mono which are the standard fonts in the v0 environment. I replaced them with Inter which may be causing an issue with its variable property or the font loading in this sandbox. The error mt is not iterable is a minified React error that occurs when something that should be iterable (like the font object's CSS properties) isn't resolving correctly. Let me revert the layout to use the Geist font while keeping the German metadata:
Now let me also revert the font variable in globals.css since we no longer need the Inter variable:
The root cause was the Inter font import replacing the original Geist font setup and the removal of the @vercel/analytics import pattern. The Inter font's variable property wasn't resolving correctly in this environment, causing a "not iterable" error when React tried to render the className template literal. I reverted the layout to use the default Geist and Geist_Mono fonts and restored the proper --font-sans CSS variable, while keeping all the German metadata and theme changes intact.
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