Add TypeScript types for components

**Problem**
When working with routes, the error messages could be more descriptive.

**Suggestion**
Improve error handling and add detailed error messages.

**Context**
This would help with debugging and maintenance.

The issue title asks for TypeScript types for components, while the body asks for more descriptive route errors. Start by locating the route and error-handling entry points, then clarify which scope is intended. Done should be defined by the selected request: either component types or detailed error messages, with no files or tests currently identified.

Written by the indexing model from the issue text.