Consider Error Type Poisoning

Add `TypeInfoKind::Error` for type poisoning (like rustc's `TyKind::Error`):

```rust
pub enum TypeInfoKind {
    // ... existing variants
    Error,  // Represents a type that couldn't be resolved
}
```

**Benefits**:
- Prevents cascading errors when a type lookup fails
- Allows type checking to continue more gracefully
- Aligns with rustc's error handling model