add multi browser mode to arragate data from all browsers by tabs list, tabs count, group list, group count and windows list

remove (unnamed) into the group names just leave it a empty string, remove Focused on windows how should the browser know what windows are focused

tests/test_client.py

@@ -3,7 +3,7 @@ from pathlib import Path
 
 import pytest
 
-from browser_cli.client import BrowserNotConnected, _resolve_socket
+from browser_cli.client import BrowserNotConnected, _resolve_socket, active_browser_targets, display_browser_name
 
 def test_resolve_socket_raises_when_registry_missing(monkeypatch):
     monkeypatch.delenv("BROWSER_CLI_PROFILE", raising=False)
@@ -38,3 +38,25 @@ def test_resolve_socket_raises_when_multiple_active_entries(monkeypatch, tmp_pat
 
     with pytest.raises(BrowserNotConnected, match="Multiple browser instances are active: uuid-1, uuid-2"):
         _resolve_socket()
+
+
+def test_display_browser_name_uses_uuid_stem_for_default():
+    assert display_browser_name("default", "/tmp/.browser_cli/550e8400-e29b-41d4-a716-446655440000.sock") == (
+        "550e8400-e29b-41d4-a716-446655440000"
+    )
+
+
+def test_active_browser_targets_filters_stale_entries(monkeypatch, tmp_path):
+    active_socket = tmp_path / "work.sock"
+    active_socket.write_text("")
+    stale_socket = tmp_path / "stale.sock"
+    registry_path = tmp_path / "registry.json"
+    registry_path.write_text(json.dumps({"work": str(active_socket), "default": str(stale_socket)}))
+
+    monkeypatch.setattr("browser_cli.client.REGISTRY_PATH", registry_path)
+
+    targets = active_browser_targets()
+
+    assert len(targets) == 1
+    assert targets[0].profile == "work"
+    assert targets[0].display_name == "work"