[TypeScript] Rename Symbol doesn't work as expected with Declaration Merging

Type: Bug

Does this issue occur when all extensions are disabled?: Yes

When renaming symbols in TypeScript, the feature doesn't take into account declaration merging. As a result, renaming symbols breaks references. Renaming the subsequent symbols to match does not fix the references. Whether the imports are explicit or default seems to have no effect.

Steps to Reproduce:

1. Create a class and a namespace with the same name, export them
2. Import the merged symbol in another file, use references to both the class and namespace
3. Attempt to rename the original class & namespace without breaking the references

// file: MyWonderfulClass.class.ts
export class MyWonderfulClass {
  // Absolutely wonderful things
}

export namespace MyWonderfulClass {
  export interface MyWonderfulClassType {}
}

export default MyWonderfulClass;

// file: script.ts
import MyWonderfulClass from "./MyWonderfulClass.class";

const inst = new MyWonderfulClass();
const obj: MyWonderfulClass.MyWonderfulClassType = {};

VS Code version: Code 1.102.0 (cb0c47c0cfaad0757385834bd89d410c78a856c0, 2025-07-09T22:10:34.600Z)
OS version: Windows_NT x64 10.0.26100
Modes:
Remote OS version: Linux x64 6.6.87.2-microsoft-standard-WSL2

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cppperfnew:31000557
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flightc:31134773
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wkspc-ranged-c:31125598
fje88620:31121564
notype1:31143045
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Reproduce the issue using MyWonderfulClass.class.ts and script.ts, following the three declaration-merging steps in the report. Then trace the Rename Symbol entry point for this case and verify that references to both the class and namespace remain valid after renaming; the issue is done when the imported instance and MyWonderfulClass.MyWonderfulClassType references still resolve.