Fix VSCode extension build after vscode-languageclient update

[abhinavgautam01]

Fixes #153.

This PR fixes the VSCode extension TypeScript build break caused by a version mismatch between vscode-languageclient v9 and older VSCode type definitions.

What changed

• Switched language client import to Node entrypoint:
• vscode/client/src/extension.ts
• from 'vscode-languageclient/node'
• Updated VSCode API/type alignment:
• vscode/client/package.json
• @types/vscode → 1.82.0
• engines.vscode → ^1.82.0
• vscode/package.json
• engines.vscode → ^1.82.0
• Updated lockfiles:
• vscode/client/package-lock.json
• vscode/package-lock.json

Validation

• cd vscode && npm run compile passes
• cargo clippy
• cargo build
• cargo test
• cargo bench

[meta-codesync]

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