[Feature] Upgrade TypeScript to 7.0.1 RC

[ConnorQi01]

Summary

Upgrade the project to compile with TypeScript 7.0.1 RC and remove the unused @typescript/native-preview dependency while keeping the current build pipeline intact.

Scope

• Update the TypeScript dev dependency to 7.0.1-rc.
• Remove @typescript/native-preview because it is not wired into the build pipeline.
• Update compatible TypeScript-adjacent tooling only as needed for build/test compatibility.
• Fix source compatibility issues found by build/test.

Out of scope

• Reworking gulp/webpack to use the native TypeScript preview compiler for build acceleration.

Validation

• npm run build
• npm test
• repeat until TS7 compatibility issues are resolved