// session.js
function getSessionId() {
    let sessionId = localStorage.getItem('session_id');
    if (!sessionId) {
        try {
            sessionId = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
                const r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
                return v.toString(16);
            });
            localStorage.setItem('session_id', sessionId);
        } catch (error) {
            console.error('Error generating session ID:', error);
        }
    }
    return sessionId;
}