Deprecation error message reporting method type as deprecated instead of method name

### 🔎 Search Terms

deprecated type

### 🕗 Version & Regression Information

- This is the behavior in every version I tried, and I reviewed the FAQ for entries about _________

### ⏯ Playground Link

https://www.typescriptlang.org/play/?ts=5.9.2#code/JYWwDg9gTgLgBAbzgLzgXzgMyhEcBEyEAJvgNwBQFAxhAHYDO8MDtdmwA5gEoCGA7gGVqACwCmIXnAC8KAHQQARgCsx1GAAoEFOLri1wwADZioAeTAxg9BgC55vOgE8NASgppXcsLwZMROACunCJulEA

### 💻 Code

```ts
import { z } from "zod";

const tsconfigRawSchema = z.object({
compilerOptions: z.any()
}).passthrough();
```

### 🙁 Actual behavior

Hover passthrough:

```
'(): ZodObject<{ compilerOptions: ZodAny; }, $loose>' is deprecated.
```

### 🙂 Expected behavior

```
'passthrough()' is deprecated.
```

or something like that.

### Additional information about the issue

_No response_

Start with the linked TypeScript Playground repro and the `passthrough()` call shown in the issue, then trace how its deprecated hover text is produced. Done means the hover reports `passthrough()` rather than the generated method type, while preserving the expected deprecation behavior.

Written by the indexing model from the issue text.