Add Color-Coding for Agenda/Calendar Entries in Verse Webmail

HCL Verse missing functionality compared to the standard HCL Notes client: UI Customization for the Agenda/Calendar, specifically the ability to color-code calendar entries.

In the Notes client, user can customize color-coding by category, sender, or meeting type to visually organize their daily schedules. Currently, the Verse agenda presents a uniform color scheme, which makes it difficult to distinguish between different types of meetings at a glance.

Bridging this feature gap between the Notes client and Verse will significantly reduce friction for users transitioning to the web client.