fix: pin @types/vscode to match engines.vscode ^1.89.0

vsce package rejects @types/vscode versions greater than engines.vscode.
Pin @types/vscode to ~1.89.0 to match the extension's minimum VS Code
engine requirement.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: vicperdana

packages/vscode-extension/package-lock.json

@@ -77,7 +77,7 @@
     "@eslint/js": "^9.28.0",
     "@types/mocha": "^10.0.6",
     "@types/node": "^24.6.1",
-    "@types/vscode": "^1.99.1",
+    "@types/vscode": "~1.89.0",
     "@typescript-eslint/eslint-plugin": "^8.45.0",
     "@typescript-eslint/parser": "^8.45.0",
     "esbuild": "^0.25.10",