feat(ext): draft extension structure (single-page mode)

packages/extension/package.json

@@ -0,0 +1,55 @@
+{
+    "name": "@page-agent/ext",
+    "private": true,
+    "version": "1.0.0-beta.1",
+    "type": "module",
+    "scripts": {
+        "dev": "wxt",
+        "dev:firefox": "wxt -b firefox",
+        "build": "wxt build",
+        "build:firefox": "wxt build -b firefox",
+        "zip": "wxt zip",
+        "zip:firefox": "wxt zip -b firefox",
+        "postinstall": "wxt prepare"
+    },
+    "devDependencies": {
+        "@tailwindcss/vite": "^4.1.18",
+        "@types/chrome": "^0.1.34",
+        "@types/react": "^19.2.8",
+        "@types/react-dom": "^19.2.1",
+        "@vitejs/plugin-react-swc": "^4.1.0",
+        "@wxt-dev/module-react": "^1.1.5",
+        "i18next": "^25.7.4",
+        "i18next-browser-languagedetector": "^8.2.0",
+        "react": "^19.2.3",
+        "react-dom": "^19.2.3",
+        "react-i18next": "^16.5.2",
+        "tailwindcss": "^4.1.14",
+        "tw-animate-css": "^1.4.0",
+        "wouter": "^3.9.0",
+        "wxt": "^0.20.13"
+    },
+    "dependencies": {
+        "@page-agent/core": "^1.0.0-beta.1",
+        "@page-agent/llms": "^1.0.0-beta.1",
+        "@page-agent/page-controller": "^1.0.0-beta.1",
+        "@page-agent/ui": "^1.0.0-beta.1",
+        "@radix-ui/react-hover-card": "^1.1.15",
+        "@radix-ui/react-icons": "^1.3.2",
+        "@radix-ui/react-label": "^2.1.8",
+        "@radix-ui/react-separator": "^1.1.8",
+        "@radix-ui/react-slot": "^1.2.4",
+        "@radix-ui/react-switch": "^1.2.6",
+        "@radix-ui/react-tooltip": "^1.2.8",
+        "@webext-core/messaging": "^2.3.0",
+        "class-variance-authority": "^0.7.1",
+        "clsx": "^2.1.1",
+        "lucide-react": "^0.562.0",
+        "motion": "^12.26.1",
+        "next-themes": "^0.4.6",
+        "rough-notation": "^0.5.1",
+        "simple-icons": "^16.5.0",
+        "sonner": "^2.0.7",
+        "tailwind-merge": "^3.4.0"
+    }
+}