This commit introduces a comprehensive notification management system with three new templates for displaying and managing notifications.
**New Features**
- Added `dashboard.html` with a notification overview featuring:
- Summary statistics for pending, sent, and failed notifications
- A table of recent notifications with status indicators
- Navigation links to view all notifications
- Added `notification_list.html` for displaying all notifications in a paginated table format
- Added `notification_detail.html` for viewing individual notification details including:
- Recipient information
- Subject and message content
- Status with visual indicators
- Timestamps for creation and delivery
- Related object information when available
**Enhancements & Refinements**
- Consistent styling across all notification templates using the existing design system
- Status badges with color coding (success for sent, error for failed, warning for pending)
- Responsive table layouts for better mobile viewing
- Empty state handling for when no notifications exist
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