feat: add smart recent activity timeline for events dashboard

[kareena0229]

Description

This PR adds a smart recent activity timeline to the Events dashboard to improve workflow continuity, personalization, and recent interaction visibility.

Previously, users needed to manually browse multiple dashboard sections to track recent event-related actions and interactions.

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Changes Made

Added Recent Activity Timeline

Implemented activity tracking for:

• event registrations
• hosted events
• waitlist activity
• recent event interactions

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Improved Timeline UX

Added:

• chronological activity ordering
• compact responsive timeline layout
• lightweight activity badges
• cleaner recent interaction visibility

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Improved Dashboard Context

Enhanced:

• personalized dashboard feedback
• recent activity continuity
• interaction visibility across sections

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Technical Improvements

• memoized derived activity state
• lightweight activity rendering
• responsive dashboard integration
• scalable timeline architecture

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Files Updated

• src/components/user/EventsTab.js

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Benefits

This enhancement improves:

• dashboard engagement
• workflow continuity
• personalization
• recent activity visibility
• dashboard usability

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Result

The Events dashboard now includes a smart recent activity timeline that provides users with quick visibility into their latest event interactions and dashboard activity.

Closes #9217

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[codescene-access]

Gates Failed
Enforce advisory code health rules (1 file with Complex Method)

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Gates Passed
3 Quality Gates Passed

Reason for failure

Enforce advisory code health rules	Violations	Code Health Impact
EventsTab.js	1 advisory rule	6.97 → 6.83	Suppress

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Quality Gate Profile: Clean Code Collective
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[kareena0229]

Implemented a smart recent activity timeline for the Events dashboard with chronological interaction tracking, compact responsive activity cards, and improved personalized dashboard visibility for recent event actions.

@SandeepVashishtha do Review