docs: note wallet session tradeoffs

src/wallet/WalletLoginModal.tsx

@@ -45,9 +45,13 @@ export function WalletLoginModal() {
     if (state !== "tpPolling") return;
 
     let cancelled = false;
+    const abortController = new AbortController();
     const poll = async () => {
       try {
-        const result = await fetchTokenPocketLoginResult(tpRequest.actionId);
+        const result = await fetchTokenPocketLoginResult(
+          tpRequest.actionId,
+          abortController.signal,
+        );
         if (cancelled) return;
         if (result.status === "completed") {
           const verified = await verifyWalletSignature({
@@ -66,8 +70,13 @@ export function WalletLoginModal() {
           setState("idle");
           setError(result.error || t("walletTpExpired"));
         }
-      } catch {
-        if (!cancelled) setError(t("walletLoginFailed"));
+      } catch (err) {
+        if (
+          !cancelled &&
+          !(err instanceof DOMException && err.name === "AbortError")
+        ) {
+          setError(t("walletLoginFailed"));
+        }
       }
     };
 
@@ -75,6 +84,7 @@ export function WalletLoginModal() {
     const timer = window.setInterval(() => void poll(), pollIntervalMs);
     return () => {
       cancelled = true;
+      abortController.abort();
       window.clearInterval(timer);
     };
   }, [completeLogin, loginModalOpen, state, tpRequest, t, showToast]);