chore(cursor-proxy-debugger): enhance traffic capture for Fork Chat and update README

- Added support for capturing and decoding Fork Chat traffic, including `ForkBackgroundComposer`, `NotifyConversationClone`, and `UploadConversationBlobs`.
- Updated the README to reflect new features and usage instructions for Fork Chat traffic.
- Modified `.gitignore` to include `proto/extensions-cursor-app/`.
- Refactored `Taskfile.yml` to improve error messages related to Cursor extensions.
- Introduced new tests for decoding functionality in `cursor-proxy-debugger`.

cursor-proxy-debugger/web/app.js

@@ -138,6 +138,7 @@ function filteredExchanges() {
     .filter((item) => {
       if (state.endpoint === "runsse" && !item.path.toLowerCase().includes("runsse")) return false;
       if (state.endpoint === "bidiappend" && !item.path.toLowerCase().includes("bidiappend")) return false;
+      if (state.endpoint === "fork" && !isForkTrafficPath(item.path)) return false;
       if (requestId && !String(item.requestId || "").toLowerCase().includes(requestId)) return false;
       if (!query) return true;
       return [item.url, item.requestId, item.requestKind, item.responseKind, item.state, String(item.status)]
@@ -151,6 +152,13 @@ function filteredExchanges() {
     });
 }
 
+function isForkTrafficPath(path) {
+  const normalized = String(path || "").toLowerCase();
+  return ["forkbackgroundcomposer", "notifyconversationclone", "uploadconversationblobs"].some((endpoint) =>
+    normalized.includes(endpoint),
+  );
+}
+
 function renderList() {
   const exchanges = filteredExchanges();
   elements.requestCount.textContent = t("count.requests", { count: exchanges.length });