test: Increase test coverage to 100% for app/websockets module

Summary

The app/websockets module currently has incomplete test coverage on two files:

File	Stmts	Miss	Cover
app/websockets/socketio_queue_manager.py	80	12	85%
app/websockets/websocket_manager.py	85	34	60%

The other two files already have 100% coverage:

• app/websockets/__init__.py — 100%
• app/websockets/consultation_queue_websocket_manager.py — 100%

Goal

Bring all files in app/websockets/ to 100% test coverage with valid tests.

Requirements

• Cover all branches, edge cases, and error paths
• Fix genuine bugs if found

Key areas to cover

websocket_manager.py (60% → 100%)

• websocket_endpoint() function — room joining (join:analytics, join:queue, generic join), duplicate join prevention, disconnect cleanup
• ConnectionManager edge cases — disconnect when not in room, broadcast to nonexistent room
• emit_queue_status_update default patient_info=None path

socketio_queue_manager.py (85% → 100%)

• SocketIO event handlers: connect, disconnect, leave_queue_room, request_queue_update
• get_queue_data() — queue_public and queue_doctors room branches, null patient/doctor/timestamp edge cases
• broadcast_queue_update() and notify_queue_change() with default rooms=None
• Convenience functions (broadcast_queue_update, notify_queue_change)