fix: relax ESLint flat config to match original rule set

The recommended presets added strict rules (no-require-imports,
no-explicit-any, no-unused-vars, no-var, prefer-const) that the
original .eslintrc.json did not enforce. Disable these to maintain
parity with the subtree source code.

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

Author: vicperdana

packages/vscode-extension/eslint.config.mjs

@@ -3,15 +3,23 @@ import eslint from "@eslint/js";
 import tseslint from "typescript-eslint";
 
 export default tseslint.config(
-    eslint.configs.recommended,
-    ...tseslint.configs.recommended,
     {
         files: ["src/**/*.ts"],
+        extends: [
+            eslint.configs.recommended,
+            ...tseslint.configs.recommended,
+        ],
         rules: {
             "@typescript-eslint/naming-convention": "warn",
             "curly": "warn",
             "eqeqeq": "warn",
             "no-throw-literal": "warn",
+            // Relax rules that the original .eslintrc.json didn't enforce
+            "@typescript-eslint/no-require-imports": "off",
+            "@typescript-eslint/no-explicit-any": "off",
+            "@typescript-eslint/no-unused-vars": "off",
+            "no-var": "off",
+            "prefer-const": "off",
         },
     },
     {