feat: Add content script to handle token reception and messaging

Author: medyo

public/content.js

@@ -0,0 +1,12 @@
+const script = document.createElement('script')
+script.src = chrome.runtime.getURL('auth.js')
+document.body.appendChild(script)
+
+// Listen for messages from the injected script
+window.addEventListener('message', (event) => {
+  if (event.source !== window || !event.data || event.data.type !== 'TOKEN_RECEIVED') {
+    return
+  }
+
+  chrome.runtime.sendMessage({ ...event.data })
+})