Allow Custom Timezone Selection for Scan Scheduling

Currently, all scan scheduling and timestamps within Halo Security are displayed in UTC by default. This can create confusion for users operating in different time zones, especially when planning maintenance windows or interpreting scan histories. Requesting a feature that allows users to select their preferred time zone (e.g., Central Time) for viewing and configuring scan schedules. This would simplify time conversions and improve usability for teams managing scan timing across various regions.