build: migrate build system to Vite and test runner to Vitest & Remove

depracated husky usage

- Replace Webpack with Vite for faster client bundling and HMR.
- Migrate tests from Jest to Vitest and update configuration.
- Update Web Worker instantiation to standard ESM syntax.
- Implement Env utility in `src/core` for safe, hybrid environment
  variable access (Vite vs Node).
- Refactor configuration loaders to remove direct `process.env`
  dependencies in shared code.
- Update TypeScript environment definitions and project scripts for the
  new toolchain.
- Remove the [depracated usage of the
  husky](https://github.com/typicode/husky/releases/tag/v9.0.1).

build(vite): implement robust git commit resolution with fallback

tests/MessageTypeClasses.test.ts

@@ -1,12 +1,13 @@
+import { vi, type MockInstance } from "vitest";
 import { getMessageTypeClasses, severityColors } from "../src/client/Utils";
 import { MessageType } from "../src/core/game/Game";
 
 describe("getMessageTypeClasses", () => {
   // Spy on console.warn to track when the default case is hit
-  let consoleSpy: jest.SpyInstance;
+  let consoleSpy: MockInstance;
 
   beforeEach(() => {
-    consoleSpy = jest.spyOn(console, "warn").mockImplementation(() => {});
+    consoleSpy = vi.spyOn(console, "warn").mockImplementation(() => {});
   });
 
   afterEach(() => {