fix(tools): wrap browser provider network calls with error handling

Wrap requests.post() in create_session() for browser_use, browserbase,
and firecrawl providers with requests.RequestException handling.
Connection timeouts and DNS resolution failures now surface as clean
RuntimeError messages instead of raw requests exception tracebacks.

Browser Use managed-gateway mode preserves raw exception propagation
so the existing idempotency-key retry semantics keep working.

Closes #2746

Co-authored-by: teknium1 <127238744+teknium1@users.noreply.github.com>

tools/browser_providers/firecrawl.py

@@ -47,12 +47,17 @@ class FirecrawlProvider(CloudBrowserProvider):
 
         body: Dict[str, object] = {"ttl": ttl}
 
-        response = requests.post(
-            f"{self._api_url()}/v2/browser",
-            headers=self._headers(),
-            json=body,
-            timeout=30,
-        )
+        try:
+            response = requests.post(
+                f"{self._api_url()}/v2/browser",
+                headers=self._headers(),
+                json=body,
+                timeout=30,
+            )
+        except requests.RequestException as exc:
+            raise RuntimeError(
+                f"Firecrawl API connection failed: {exc}"
+            ) from exc
 
         if not response.ok:
             raise RuntimeError(