feat: Implement Gogh Theme Engine with options page, theme parsing, and semantic theme derivation

We're cooked. <skull emoji>

- Added options page for YAML palette editing, live color preview, and diagnostics.
- Implemented theme engine to parse Gogh YAML palettes and derive semantic themes.
- Configured TypeScript and Vite for building the extension.
- Created new tab and popup HTML pages with corresponding scripts and styles.
- Established storage management for user configurations in Chrome storage.
- Added icons for the extension and updated manifest for MV3 compatibility.

common/storage.test.js

@@ -0,0 +1,42 @@
+import * as storageModule from "./storage";
+
+const get = jest.fn();
+const set = jest.fn();
+
+global.chrome = {
+  storage: {
+    sync: {
+      set,
+      get
+    }
+  }
+};
+
+const chromeGetStorageSpy = jest.spyOn(chrome.storage.sync, 'get');
+const chromeSetStorageSpy = jest.spyOn(chrome.storage.sync, 'set');
+
+describe("storage → getStorage", () => {
+  beforeEach(() => {
+      jest.resetAllMocks();
+  }); 
+
+  test("chrome get storage api method called", () => {
+    const getCallback = jest.fn();
+    
+    storageModule.getStorage("Test", getCallback);
+      
+    expect(chromeGetStorageSpy).toHaveBeenCalledWith(["Test"], expect.any(Function));
+  });
+});
+
+describe("storage → setStorage", () => {
+    beforeEach(() => {
+        jest.resetAllMocks();
+    }); 
+
+    test("chrome set storage api method called", () => {
+        storageModule.setStorage("Test", "Value");
+        
+        expect(chromeSetStorageSpy).toHaveBeenCalledWith({["Test"]: "Value"});
+    });
+});