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.

gogh-theme-engine/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "gogh-theme-engine",
+  "version": "1.0.0",
+  "description": "Production-grade Chrome Extension that applies Gogh-style 16-color terminal palettes to web pages using perceptual color remapping (OKLCH).",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite build --watch --mode development",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview"
+  },
+  "devDependencies": {
+    "@crxjs/vite-plugin": "^2.0.0-beta.25",
+    "@types/chrome": "^0.0.268",
+    "@types/node": "^25.3.3",
+    "sass": "^1.77.0",
+    "typescript": "^5.4.5",
+    "vite": "^5.2.11"
+  },
+  "dependencies": {
+    "js-yaml": "^4.1.0"
+  }
+}