Added dashboard

[Harbduls]

Closes #172

PR: Implement Notification Analytics Dashboard

Description

This pull request introduces a comprehensive Notification Analytics Dashboard that provides senders with actionable insights into notification performance across the NotifyChain platform.

The dashboard aggregates both on-chain and off-chain notification metrics, enabling users to monitor delivery effectiveness, track recipient engagement, and analyze notification trends over time. The implementation focuses on usability, performance, and responsiveness across different devices.

Changes Made

Analytics Dashboard

• Added analytics overview page for notification insights.
• Integrated data sources for both on-chain and off-chain metrics.
• Implemented summary cards for key performance indicators.

Metrics & Reporting

• Added notification delivery rate tracking.
• Added acknowledgment rate tracking.
• Displayed aggregated performance statistics.
• Improved metric calculation accuracy.

Data Visualization

• Added trend charts for notification activity.
• Implemented historical performance visualization.
• Added support for analytics data filtering.

User Experience

• Added date range filtering functionality.
• Implemented loading skeletons for analytics components.
• Improved dashboard responsiveness for mobile devices.
• Added error handling and empty-state messaging.

Testing

• Verified analytics data loads successfully.
• Tested date filtering across multiple ranges.
• Validated delivery and acknowledgment calculations.
• Tested responsive layouts on mobile and desktop devices.
• Verified loading and error states.

Acceptance Criteria

• Dashboard loads analytics successfully.
• Filters update displayed metrics correctly.
• Delivery and acknowledgment rates are displayed accurately.
• Trend charts render analytics data properly.
• Visualizations remain responsive on mobile devices.
• Loading states provide clear user feedback.

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