Design a Smart Notification Center with Prioritized Alert Categories

Design a notification center for [APPLICATION TYPE, e.g., project management tool, e-commerce app, social network] that serves [TARGET USER PERSONA]. The notification center should handle [ESTIMATED DAILY NOTIFICATION VOLUME] notifications per user per day without causing fatigue. Address the following design requirements: 1. **Entry Point & Badge**: Design the notification bell/icon placement in the [TOP NAV / SIDEBAR / BOTTOM TAB BAR]. Define badge behavior — show count, dot indicator, or both. Specify max count display (e.g., 99+). 2. **Notification Categories**: Create [NUMBER] distinct categories such as [CATEGORY 1, e.g., mentions], [CATEGORY 2, e.g., system alerts], [CATEGORY 3, e.g., updates]. Assign each a unique icon and color accent. 3. **Panel/Page Layout**: Design either a dropdown panel (max height [VALUE]px) or a full-page notification center. Include filter tabs for All, Unread, and each category. Show timestamp formatting rules (e.g., "2m ago" vs "Dec 15"). 4. **Notification Anatomy**: Define the structure of a single notification item — avatar/icon, title, body text (truncation rules), timestamp, read/unread indicator, and inline action buttons like [ACTION 1, e.g., Accept] and [ACTION 2, e.g., Dismiss]. 5. **Bulk Actions**: Mark all as read, clear all, mute category. 6. **Empty State**: Design for zero notifications with a friendly illustration and message. 7. **Priority System**: Define visual differentiation for urgent, standard, and low-priority notifications. Specify animation for new incoming notifications, transition for marking as read, and how grouped/stacked notifications from the same source behave.