chore(test): clean up test setup and configuration

- Remove orphaned deps (chai, mocha, @types/mocha, @types/chai, @types/glob, @vscode/test-electron) left after integration tests were deleted
- Create vitest.config.ts and simplify test script (no more inline CLI flags)
- Remove redundant globalThis.__WEB__ setup in shared.ts (already set by vitest environment)

Author: Ilanaya

package.json

@@ -135,8 +135,7 @@
         "build-plugin:npm": "tsc -p typescript/tsconfig.npm.json",
         "lint": "eslint {src/**,typescript/src/**}",
         "format": "prettier --write '{src,typescript}/**/*.ts' --ignore-path .gitignore",
-        "test": "pnpm test-plugin --run",
-        "test-plugin": "vitest --globals --dir typescript/test/ --environment ts-plugin",
+        "test": "vitest",
         "postinstall": "patch-package && tsm ./typescript/scripts/patchModules.ts"
     },
     "devDependencies": {
@@ -179,16 +178,11 @@
         ]
     },
     "dependencies": {
-        "@types/chai": "^4.3.3",
-        "@types/glob": "^8.0.0",
         "@types/lodash": "^4.14.182",
-        "@types/mocha": "^9.1.1",
         "@types/pluralize": "^0.0.29",
         "@vscode/emmet-helper": "^2.8.4",
-        "@vscode/test-electron": "^2.1.5",
         "@zardoy/utils": "^0.0.9",
         "@zardoy/vscode-utils": "^0.0.52",
-        "chai": "^4.3.6",
         "change-case": "^4.1.2",
         "delay": "^5.0.0",
         "escape-string-regexp": "^5.0.0",
@@ -198,7 +192,6 @@
         "lodash": "^4.17.21",
         "lodash.get": "^4.4.2",
         "lodash.throttle": "^4.1.1",
-        "mocha": "^10.0.0",
         "path-browserify": "^1.0.1",
         "pluralize": "github:plurals/pluralize#36f03cd2d573fa6d23e12e1529fa4627e2af74b4",
         "rambda": "^7.2.1",