"used before being assigned" fires on LHS inside parens/type assertion

まだ誰も着手していません。

### 🔎 Search Terms

used before being assigned cast type assertion left side LHS parens parentheses

### 🕗 Version & Regression Information

- This is the behavior changed in 5.7

### ⏯ Playground Link

https://www.typescriptlang.org/play/?ts=5.9.0-dev.20250725#code/CYUwxgNghgTiAEAzArgOzAFwJYHtX1AGcwYsAjEAClSgFsQAueQjU1AcwBolUnKBKeAF4AfPABuOLMH5NJ0gLAAoZaEiwEKdNjzwKiHHACiUMAAtKiXvAHCx8mXKnAA3MtXhoceOsKF4AMo49BhmWBzwAN7K8Eg4OAJMqMi0FDBuSgC+7kpEJORUAESF3LaiUTHwECAYetBmTEEhYRwZlfqGICbmlGVi0UqxsZRk9fBQ-lCoAJ6CQj7QfvAA6jgA7lGZGbGZ-Mq7OR7EpBSUxaVz-ZXVtaNQDYHBNS3sbYN6IAbGphZ9Fe-DO5mOYLCb+VYbSJbSoHLJ7JRAA

### 💻 Code

```ts
declare function describe(name: string, fn: () => void): void

declare function beforeEach(fn: () => void): void;

declare class Something {
foo(): number;
}

describe("", () => {
let blah: Something;

beforeEach(() => {
(blah as any) = class Wow {};
})
})

describe("", () => {
let blah: Something;

beforeEach(() => {
(blah) = class Wow {};
})
})
```

### 🙁 Actual behavior

Both assignments error with `is used before being assigned`.

### 🙂 Expected behavior

Neither should, as they are writes.

### Additional information about the issue

_No response_