add extension icons and update the version

extension/icon.svg

@@ -0,0 +1,28 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" role="img" aria-labelledby="title">
+  <title>browser-cli icon</title>
+  <defs>
+    <linearGradient id="bg" x1="12" y1="10" x2="116" y2="118" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#0f766e" />
+      <stop offset="1" stop-color="#0f172a" />
+    </linearGradient>
+    <linearGradient id="panel" x1="28" y1="24" x2="100" y2="104" gradientUnits="userSpaceOnUse">
+      <stop offset="0" stop-color="#f8fafc" />
+      <stop offset="1" stop-color="#cbd5e1" />
+    </linearGradient>
+  </defs>
+
+  <rect x="8" y="8" width="112" height="112" rx="28" fill="url(#bg)" />
+  <rect x="25" y="25" width="78" height="66" rx="14" fill="url(#panel)" />
+  <rect x="25" y="25" width="78" height="15" rx="14" fill="#94a3b8" />
+  <circle cx="36" cy="32.5" r="2.5" fill="#f8fafc" />
+  <circle cx="44" cy="32.5" r="2.5" fill="#f8fafc" opacity="0.85" />
+  <circle cx="52" cy="32.5" r="2.5" fill="#f8fafc" opacity="0.7" />
+
+  <path d="M46 56 35 64l11 8" fill="none" stroke="#0f172a" stroke-linecap="round" stroke-linejoin="round" stroke-width="8" />
+  <path d="M62 52h19" fill="none" stroke="#0f766e" stroke-linecap="round" stroke-width="8" />
+  <path d="M62 65h26" fill="none" stroke="#0f766e" stroke-linecap="round" stroke-width="8" />
+
+  <rect x="69" y="77" width="26" height="17" rx="6" fill="#14b8a6" />
+  <rect x="56" y="84" width="26" height="17" rx="6" fill="#2dd4bf" />
+  <rect x="43" y="91" width="26" height="17" rx="6" fill="#99f6e4" />
+</svg>

extension/manifest.json

@@ -1,7 +1,7 @@
 {
   "manifest_version": 3,
   "name": "browser-cli",
-  "version": "0.1.0",
+  "version": "0.4.0",
   "description": "Control your browser from the terminal via browser-cli",
   "permissions": [
     "tabs",
@@ -16,7 +16,17 @@
   "background": {
     "service_worker": "background.js"
   },
+  "icons": {
+    "16": "icons/icon-16.png",
+    "32": "icons/icon-32.png",
+    "48": "icons/icon-48.png",
+    "128": "icons/icon-128.png"
+  },
   "action": {
-    "default_title": "browser-cli"
+    "default_title": "browser-cli",
+    "default_icon": {
+      "16": "icons/icon-16.png",
+      "32": "icons/icon-32.png"
+    }
   }
 }