Add request interception for getgeoidx API calls

- Introduced a new script (inject.js) to override the fetch and XMLHttpRequest methods to capture requests to the "getgeoidx" endpoint.
- Captured request body and URL, and sent the data to the extension via postMessage.
- Added intercept.js to inject the new script into the page and listen for messages to forward captured data to the extension.

js/intercept.js

@@ -0,0 +1,11 @@
+// inject into page
+const s = document.createElement("script");
+s.src = chrome.runtime.getURL("js/inject.js");
+(document.head||document.documentElement).appendChild(s);
+
+// listen for page→extension
+window.addEventListener("message", e => {
+  if (e.source === window && e.data?.type === "ZMS_CAPTURE") {
+    chrome.runtime.sendMessage({ command: "CAPTURED", data: e.data.body });
+  }
+});