Accept tab_opened session events

The API has sent tab_opened events since browserctrl #559, and the event
type Literal refused them, so listing such a session's events failed.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019dbwbLvQGyzwkxNetvqf3v

Author: AHarmlessPyro

hyperbrowser/models/consts.py

@@ -25,6 +25,7 @@
     "captcha_solved",
     "captcha_error",
     "file_downloaded",
+    "tab_opened",
     "credential_filled",
     "credential_fill_refused",
 ]

tests/test_session_event_logs.py

@@ -0,0 +1,22 @@
+import pytest
+
+from hyperbrowser.models.session import SessionEventLog
+
+
+@pytest.mark.parametrize(
+    "event_type", ["tab_opened", "credential_filled", "credential_fill_refused"]
+)
+def test_event_log_types_the_api_sends_parse(event_type):
+    event = SessionEventLog.model_validate(
+        {
+            "id": "e1",
+            "sessionId": "s1",
+            "targetId": None,
+            "pageUrl": "https://example.com/",
+            "teamId": "t1",
+            "type": event_type,
+            "metadata": {},
+            "timestamp": 1,
+        }
+    )
+    assert event.type == event_type