fix(plugins/browser): carry forward requests.RequestException wrapping

PR #25580 was authored before #2746 landed on main, so its plugin
versions of browser_use/browserbase/firecrawl ship without the
requests.RequestException → RuntimeError wrapping that 13c72fb4 added
to the legacy tools/browser_providers/ files for #2746. Cherry-picking
the PR + git rm'ing the legacy files (the migration's intent) would
silently revert that network-error fix.

Port the same try/except pattern into the three plugin create_session()
methods. Browser Use managed-mode keeps its raw-exception propagation
(idempotency-key retry semantics).

Co-authored-by: nidhi-singh02 <nidhi2894@gmail.com>

plugins/browser/firecrawl/provider.py

@@ -82,12 +82,17 @@ class FirecrawlBrowserProvider(BrowserProvider):
 
         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(