feat: add popup and options pages for LexAI extension

- Created index.html for options page with basic structure.
- Implemented Popup component in Popup.tsx with state management for user input and actions.
- Added index.html for popup page with necessary scripts.
- Included various icon assets for the extension.
- Designed SVG icon for the extension with gradient background and lightning bolt.
- Added multiple screenshots for Chrome Web Store listing.
- Configured WXT for building the Chrome extension with manifest settings.

packages/chrome/public/icon.svg

@@ -0,0 +1,27 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 128 128" width="128" height="128">
+  <!-- Background circle with gradient -->
+  <defs>
+    <linearGradient id="bgGrad" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#6366f1;stop-opacity:1" />
+      <stop offset="100%" style="stop-color:#8b5cf6;stop-opacity:1" />
+    </linearGradient>
+    <linearGradient id="boltGrad" x1="0%" y1="0%" x2="100%" y2="100%">
+      <stop offset="0%" style="stop-color:#fde68a;stop-opacity:1" />
+      <stop offset="100%" style="stop-color:#fbbf24;stop-opacity:1" />
+    </linearGradient>
+  </defs>
+
+  <!-- Background rounded square -->
+  <rect x="4" y="4" width="120" height="120" rx="26" ry="26" fill="url(#bgGrad)" />
+
+  <!-- Subtle inner glow -->
+  <rect x="4" y="4" width="120" height="120" rx="26" ry="26"
+    fill="none" stroke="rgba(255,255,255,0.15)" stroke-width="2"/>
+
+  <!-- Lightning bolt shape -->
+  <polygon points="72,14 38,68 62,68 56,114 90,60 66,60"
+    fill="url(#boltGrad)"
+    stroke="rgba(255,255,255,0.3)"
+    stroke-width="1.5"
+    stroke-linejoin="round"/>
+</svg>